Perhaps you should try some spelling variations:
quan thanh » ban thanh, van thanh
thanh tai » thanh hai, thanh toan, doanh tai
xach tay » canh tay
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
van lam » van nam
lam qua » lam cua, nam qua, lam quang
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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 xa hoi. hieu van lam qua quan thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (xach tay)) nang xa hoi. hieu van lam qua quan thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (xach tay)) nang xa hoi. hieu van lam qua quan thanh tai cua tre*.