Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
ho hieu » ho chieu, hoi hieu, nho hieu
tac van » tac vang, cac van, tac va

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 cua ((tong cong) or (dung cong)) tac van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - hanh trinh cua ((tong cong) OR (dung cong)) tac van ban.
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - hanh trinh cua ((tong cong) or (dung cong)) tac van ban*.