Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
quang trung » truong trung
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
cong tan » cong thanh, cong ty, cong ha
cong tac » cong ty
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 quang trung ((((cong tan) OR (cong tac))) or (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trinh quang trung ((((cong tan) OR (cong tac))) OR (cong san)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh trinh quang trung ((((cong tan) OR (cong tac))) or (cong san)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trinh quang trung ((((cong tan) OR (cong tac))) or (cong san)) toan ban*.