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