Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
trinh qua » trinh quan, trinh cua, trinh luat
thong san » thong sang, trong san, thong dan
thong van » trong van, thong va, thong quan
toan ban » van 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 - hanh ((trinh qua) or (trinh quang)) thong ((thong san) OR (thong van)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((trinh qua) OR (trinh quang)) thong ((thong san) OR (thong van)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((trinh qua) or (trinh quang)) thong ((thong san) OR (thong van)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trinh qua) or (trinh quang)) thong ((thong san) OR (thong van)) toan ban*.