Perhaps you should try some spelling variations:
cang thang » dang thanh
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh quan
tranh cua » doanh cua, manh cua
manh toan » thanh toan, anh tuan, tinh toan
doi hieu » doi chieu, doc hieu, doi hien
toan ban » van 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 ((trinh cua) or (tranh cua)) ((cang thang) OR (cong thanh)) manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ((trinh cua) OR (tranh cua)) ((cang thang) OR (cong thanh)) manh toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh ((trinh cua) or (tranh cua)) ((cang thang) OR (cong thanh)) manh toan ban*".