Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
dua tren » dung tren
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu nang xa hoi. hieu qua cac tuc van hanh tai ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang xa hoi. hieu qua cac tuc van hanh tai ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang xa hoi. hieu qua cac tuc van hanh tai ((dua tren) or (cua triet))*.