Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
danh dai » danh dau, danh di, danh sai
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, vu khach
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
su sach » so sach
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) ky nang xa hoi. hieu van cac truc va danh dai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky nang xa hoi. hieu van cac truc va danh dai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky nang xa hoi. hieu van cac truc va danh dai ((cua tre) or (cuu tre))*.