Perhaps you should try some spelling variations:
trung thanh » truong thanh
thieu sang » chieu sang, thieu khang, thieu quang
trang tuan » tran tuan, trung tuan, trong tuan
duong cong » dung cong, luong cong, duong trong
hoc thieu » toc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
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 - thanh ((trang tuan) or (trung thanh)) duong cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh ((trang tuan) OR (trung thanh)) duong cong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh ((trang tuan) or (trung thanh)) duong cong tan toan cau*.