Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
hieu van » hieu va, thien van, lieu va
danh dai » danh dau, danh sai, vanh dai
danh di » danh du, xanh di, danh dien
thuc va » thuc vat, thuc dan, thuc day
vu sach » vu bach, vu khach
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
su sach » so sach
cua tre » cua te, cuu tre, cua triet

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 thuc va ((danh dai) or (danh di)) cua 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 thuc va ((danh dai) OR (danh di)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky nang xa hoi. hieu van cac thuc va ((danh dai) or (danh di)) cua tre*.