Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
dung cong » dung trong
hoi hieu » hoi phieu, hoi tieu, moi hieu
quan dau » quan cau, qua dau, quan dac
ho hieu » ho chieu, nho hieu, co hieu
tinh va » tich va, trinh van, trinh vat
va dung » van dung, va duong, vat dung

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) or (hoi hieu)) lang - hanh tinh va dung cong trinh quan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoi hieu)) lang - hanh tinh va dung cong trinh quan dau.
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (hoi hieu)) lang - hanh tinh va dung cong trinh quan dau*.