Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
trinh qua » trinh quan, trinh quang, trinh luan
trinh cua » tinh cua, trinh quan, trinh luan
ban cong » bang cong, van cong, phan cong
cong thi » cong thai, cong khi, dong thi
thi tren » thai tren, thi tran, thi trang
tren tau » tren thuc, tren may, tren dat
ho hieu » ho chieu, hoi hieu, nho hieu
luat » luan, xuat

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

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