Perhaps you should try some spelling variations:
trang thanh » trung thanh, tang thanh, trong thanh
thieu sang » chieu sang, thieu khang, thieu quang
chieu sach » chinh sach, chiet tach, chieu sang
tran thanh » ban thanh, van thanh, quan thanh
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
dung cong » dung trong
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 ((thieu sang) or (chieu sach)) - thanh ((trang thanh) OR (tran thanh)) dung cong thanh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sach)) - thanh ((trang thanh) OR (tran thanh)) dung cong thanh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sach)) - thanh ((trang thanh) OR (tran thanh)) dung cong thanh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sach)) - thanh ((trang thanh) OR (tran thanh)) dung cong thanh toan cau*.