Perhaps you should try some spelling variations:
thanh do » thanh de, thanh pho, thanh hoa
hieu van » hieu va, thien van, lieu va
cau tre » cau tren, cau treo, cau tra
van cam » van nam, van lam, van cau
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
loc va » hoc va, luc va
do cau » dao cau, bo cau, co cau
tu can » tu ban, tu cac, thu canh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu can ((ky tang) or (ky dang)) xa hoi. hieu van cam ((loc va) or (tuc xa)) thanh do cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ((ky tang) OR (ky dang)) xa hoi. hieu van cam ((loc va) OR (tuc xa)) thanh do cau tre.
• Adding a wildcard symbol may retrieve word variants: tu can ((ky tang) or (ky dang)) xa hoi. hieu van cam ((loc va) or (tuc xa)) thanh do cau tre*.