Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
tuc van » thuc van, truc van, tuc va
cua tre » cua te, cuu tre, cua triet
so sach » so sanh, bo sach, co sach
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
cac tuc » cac toc, cac tu, cac tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang xa) or (nang cao)) hoi. hieu van cac tuc van hanh vai ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (nang cao)) hoi. hieu van cac tuc van hanh vai ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (nang cao)) hoi. hieu van cac tuc van hanh vai ((cua tre) or (cau tren))*.