Perhaps you should try some spelling variations:
thong quang » thong quan, thong qua, luong quang
quang trung » truong trung
thieu sang » chieu sang, thieu khang, thieu quang
manh thong » anh thong, manh tuong, mang thong
hoc thieu » toc thieu, hoc hien
tuong dan » huong dan, tung dan, xuong dan
uong dan » huong dan, xuong dan, duong dan
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 - manh thong quang trung ((uong dan) or (tuong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - manh thong quang trung ((uong dan) OR (tuong dan)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - manh thong quang trung ((uong dan) or (tuong dan)) toan cao*.