Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
lieu tinh » trieu tinh, diep tinh, bien tinh
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban
so lieu » so dieu
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so lieu tinh - hanh trinh ((va hang) or (va nang)) cong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so lieu tinh - hanh trinh ((va hang) OR (va nang)) cong dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: so lieu tinh - hanh trinh ((va hang) or (va nang)) cong dan ((toan cao) or (toan ban))*.