Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, nhung don
hang cong » dang cong, hang nong, bang cong
hoc tien » hoc tieng, hoc hien, hoc vien
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tien thanh - canh trinh va ((nhung cong) or (hang cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien thanh - canh trinh va ((nhung cong) OR (hang cong)) dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc tien thanh - canh trinh va ((nhung cong) or (hang cong)) dan toan cao*.