Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
trinh quan » tinh quang, trinh han
trinh qua » trinh cua, trinh quang, trinh luan
ban cong » bang cong, van cong, phan cong
cong tac » cong ty
tac tren » rac tren, tai tren, tap tren
tren tau » tren thuc, tren may, tren dat
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu quang - hanh ((((trinh qua) OR (trinh quan))) or (trinh luat)) ban cong tac tren tau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - hanh ((((trinh qua) OR (trinh quan))) OR (trinh luat)) ban cong tac tren tau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quang - hanh ((((trinh qua) OR (trinh quan))) or (trinh luat)) ban cong tac tren tau".
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - hanh ((((trinh qua) OR (trinh quan))) or (trinh luat)) ban cong tac tren tau*.