Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh vat » trinh van, trinh luat, sinh vat
tong cong » trong cong, cong cong, dung cong
hoc tien » hoc tieng, hoc hien, hoc vien
pho cau » pho cap, pha cau, pho cam

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 vat ((ung dung) or (tong cong)) thanh pho cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien thanh - canh trinh vat ((ung dung) OR (tong cong)) thanh pho cau.
• Adding a wildcard symbol may retrieve word variants: hoc tien thanh - canh trinh vat ((ung dung) or (tong cong)) thanh pho cau*.