Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
danh tu » anh tu, doanh thu
vu sach » vu bach, su sach, vu khach
van bac » van ban, van bao, van hac
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang

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 vat)) danh tu ((cua tre) or (cau tren))~.
• 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 vat)) danh tu ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. hieu van bac ((tuc va) or (thuc vat)) danh tu ((cua tre) or (cau tren))*.