Perhaps you should try some spelling variations:
xach tay » canh tay
nang dai » nang dau, nang tai, lang dai
hieu van » hieu va, thien van, lieu va
hai hau » hai chau, dai hau, hai hai
hai cau » hai chau, hai chu, hoi cau
dau tuc » dau tu, dao tuc, cau truc
dai hoi » dai hoc, dai hai, dai moi
van dau » van dao, phan dau
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach y) or (xach tay)) nang dai hoi. hieu van dau tuc va dan ((hai cau) or (hai hau)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (xach tay)) nang dai hoi. hieu van dau tuc va dan ((hai cau) OR (hai hau)) triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (xach tay)) nang dai hoi. hieu van dau tuc va dan ((hai cau) or (hai hau)) triet*.