Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh xuan » trinh quan, trinh luan, trinh luat
thong cong » tong cong, thong thong, phong chong
bien tinh » bi tinh, yen tinh, diep tinh
toan cao » toan ban
toan tap » toan ban
co bien » co dien, so bien, bo bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: co bien tinh - hanh trinh xuan ((thong cong) or (trong cong)) tan ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co bien tinh - hanh trinh xuan ((thong cong) OR (trong cong)) tan ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: co bien tinh - hanh trinh xuan ((thong cong) or (trong cong)) tan ((toan cao) or (toan tap))*.