Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
doi chieu » doc hieu, doi chi, mot chieu
luan han » luan hoan, luan phan, luan van
han cong » phan cong, hang cong, hanh cong
cong tac » cong ty
tac chat » tao chat, cac chat, tac phat
chat cam » chat cao, thuat cam, chat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (toc thieu)) tang - canh tranh luan han cong tac chat cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) tang - canh tranh luan han cong tac chat cam*.