Perhaps you should try some spelling variations:
cau trang » chu trang, cai trang, cau thang
hieu van » hieu va, thien van, lieu va
trang va » tran van, hang va
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sac ky » cac ky, sai ky

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

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