Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cua viet » ca viet, hoa viet, cua vat
danh dau » lanh dao, hang dau, danh tu
va danh » va dinh, va dan, va hanh
te sach » toc sach
qua cac » cua cac
tu nong » tu dong, tu cong, tu tong
tu lang » cu lang, tu lanh, xu lang
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((tu lang) or (tu nong)) xa hoi. hieu qua cac tuc va danh dau ((cua viet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu lang) OR (tu nong)) xa hoi. hieu qua cac tuc va danh dau ((cua viet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: te sach ((tu lang) or (tu nong)) xa hoi. hieu qua cac tuc va danh dau ((cua viet) or (va triet))*.