Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu sang » chieu sach, chieu xanh, hieu lang
tran thanh » ban thanh, van thanh, quan thanh
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tai
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: ho chieu sang - thanh ((tran thanh) or (trung thanh)) dung cong tan ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - thanh ((tran thanh) OR (trung thanh)) dung cong tan ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - thanh ((tran thanh) or (trung thanh)) dung cong tan ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh ((tran thanh) or (trung thanh)) dung cong tan ((toan cau) OR (toan tap))*.