Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
danh dau » lanh dao, hang dau, danh tu
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, su sach, vu khach
van bac » van ban, van bao, van hac
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
tuc va » truc va, tuc xa, duc va

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 y nang xa hoi. hieu van bac ((tuc va) or (thuc va)) danh dau ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang xa hoi. hieu van bac ((tuc va) OR (thuc va)) danh dau ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. hieu van bac ((tuc va) or (thuc va)) danh dau ((cua tre) or (cau treo))*.