Perhaps you should try some spelling variations:
trang tuan » tran tuan, trung tuan, trong tuan
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
doi hieu » doi chieu, doc hieu, doi hien
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - hanh ((trang tuan) or (trinh luat)) dung cong thanh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ((trang tuan) OR (trinh luat)) dung cong thanh toan tap*.