Perhaps you should try some spelling variations:
sach phan » sach han, mach phan, sach phat
hoc tcong » hoc cong, hoc trong, hoc thong
tcong tan » cong tan, trong tan, trong tang
sach cha » sach nha, sach che, sach ha
doi cong » doi song, noi cong, moi cong
ve nguoi » va nguoi, le nguoi, ve nguon
thu sach » thuat sach, thuoc sach, thu hoach
giai hoc » dai hoc, bai hoc, thai hoc
tu sach » su sach, te sach, tu cach
phan ve » phan le, phan va, pha ve
do cong » do hong, bo cong, so cong
me giai » de giai, ve giai, ke giai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach cha me giai hoc tcong tan ) or ( tu sach phan ve nguoi ((do cong) OR (doi cong)) tan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach cha me giai hoc tcong tan ) OR ( tu sach phan ve nguoi ((do cong) OR (doi cong)) tan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu sach cha me giai hoc tcong tan ) or ( tu sach phan ve nguoi ((do cong) OR (doi cong)) tan ))".
• Adding a wildcard symbol may retrieve word variants: (( thu sach cha me giai hoc tcong tan ) or ( tu sach phan ve nguoi ((do cong) OR (doi cong)) tan ))*.