Perhaps you should try some spelling variations:
sach phan » sach han, mach phan, sach phat
hoc tcong » hoc cong, hoc trong, hoc thong
tcong tac » tuong tac, trong tac, cong tan
thu sach » thuat sach, thuoc sach, thu hoach
sach cha » sach nha, sach che, sach ha
cong tac » cong ty
ke giai » kem giai, de giai, ke giao
tu sach » su sach, te sach, tu cach
me giai » de giai, ve giai, le giai
phan ve » phan le, phan va, pha ve
ve gioi » ve giai, vien gioi, van gioi
gioi co » nguoi co
co cong » cao cong, cho cong, bo cong

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) or (ke giai)) hoc tcong tac ) or ( tu sach phan ve gioi co cong tac ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach cha ((me giai) OR (ke giai)) hoc tcong tac ) OR ( tu sach phan ve gioi co cong tac )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach cha ((me giai) or (ke giai)) hoc tcong tac ) or ( tu sach phan ve gioi co cong tac ))*.