Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
thanh tuong » thanh thuong, thanh tung, thanh huong
hieu sang » chieu sang, hieu lang, hieu quang
tuong dan » huong dan, tung dan, xuong dan
dan nhung » ban nhung, dap nhung, san nhung
khoan cam » khoa cam, khoan va, phan cam
doc hieu » toc thieu, hoc thieu, hoc hien
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, phan cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - thanh tuong dan nhung tuong dan ((than cau) or (((khan cap) OR (khoan cam))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - thanh tuong dan nhung tuong dan ((than cau) OR (((khan cap) OR (khoan cam)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sang - thanh tuong dan nhung tuong dan ((than cau) or (((khan cap) OR (khoan cam))))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - thanh tuong dan nhung tuong dan ((than cau) or (((khan cap) OR (khoan cam))))*.