Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trang » thanh trung, canh tranh, hanh trinh
hoc thieu » toc thieu, hoc hien
va phuong » va thuong, cac phuong
thong dan » thong van, tuong dan, thong den
toan cao » toan tap
toan ban » van ban
va cong » tai cong, cua cong

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 trang ((va cong) or (va phuong)) thong dan ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trang ((va cong) OR (va phuong)) thong dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh trang ((va cong) or (va phuong)) thong dan ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trang ((va cong) or (va phuong)) thong dan ((toan cao) OR (toan ban))*.