Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
chau tinh » cuu tinh, ha tinh, cua tinh
tang luan » dung luan
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
anh tang » anh bang, anh dang, anh nang
luan han » luan hoan, luan phan, luan van
han cong » phan cong, hang cong, hanh cong
toan cau » 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 ((chau tinh) or (tien thanh)) - anh tang luan han cong manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chau tinh) OR (tien thanh)) - anh tang luan han cong manh toan cau*.