Perhaps you should try some spelling variations:
thong thuong » thong thong, hang thuong, cong thuong
chieu sang » chieu sach, chieu xanh, hieu lang
hanh huong » thanh huong, manh huong, canh huong
thuong dan » huong dan, thuong han, thuong dam
cua thong » cua thuong, cua khong, cua tong
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (trieu tinh)) - ((hanh huong) OR (anh huong)) cua thong thuong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (trieu tinh)) - ((hanh huong) OR (anh huong)) cua thong thuong dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (trieu tinh)) - ((hanh huong) OR (anh huong)) cua thong thuong dan than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (trieu tinh)) - ((hanh huong) OR (anh huong)) cua thong thuong dan than cao*.