Perhaps you should try some spelling variations:
tien tinh » tien thinh, tien trinh, thien tinh
lang luan » tang luan, hang luan, bang luan
phan cong » thanh cong
dan trinh » dan tinh, van trinh, hanh trinh
trinh han » trinh quan
hoc tien » hoc tieng, hoc hien, hoc vien
cong dan » cong san, cong tan, huong dan

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 (dung luan)) phan cong dan trinh han~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien tinh - nhanh ((lang luan) OR (dung luan)) phan cong dan trinh han*.