Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
dao van » do van, dang van
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tuc ca » tuc cac, tuc cua, tuc xa
dao va » tao va, do va, cao va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) ky lang xa hoi. hieu va cac tuc ca ((dao va) or (dao van)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky lang xa hoi. hieu va cac tuc ca ((dao va) OR (dao van)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky lang xa hoi. hieu va cac tuc ca ((dao va) or (dao van)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky lang xa hoi. hieu va cac tuc ca ((dao va) or (dao van)) cua te*.