Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
hieu lang » chieu sang, hieu quang, nhieu tang
cap nhung » cam nhung, vap nhung, canh nhung
dap nhung » vap nhung, va nhung, dap ung
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 (hieu lang)) - thanh trung ((cap nhung) OR (dap nhung)) cong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (hieu lang)) - thanh trung ((cap nhung) OR (dap nhung)) cong tan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (hieu lang)) - thanh trung ((cap nhung) OR (dap nhung)) cong tan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (hieu lang)) - thanh trung ((cap nhung) OR (dap nhung)) cong tan toan tap*.