Perhaps you should try some spelling variations:
tien tinh » tien thinh, tien trinh, thien tinh
lang luan » tang luan, hang luan, lang xuan
bang luan » tang luan, hang luan, dung luan
hanh cong » thanh cong, hang cong, hanh dong
tan tranh » tan tran, can tranh, lan tranh
tranh ban » trinh ban, tranh hang, tranh luan
hoc tien » hoc tieng, hoc hien, hoc vien
cong tan » cong tac, cong san, cong thanh

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 tinh - nhanh ((lang luan) or (bang luan)) hanh cong tan tranh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien tinh - nhanh ((lang luan) OR (bang luan)) hanh cong tan tranh ban*.