Perhaps you should try some spelling variations:
thuoc dieu » thuc dieu, hoc dieu, thuat dieu
hanh trinh » canh tranh, hanh chinh
theo dieu » theo tieu, theo chieu, he dieu
cong tan » cong tac, cong san, cong thanh
va hang » van hang, va nang, va hanh
va lang » va nang, hoa lang
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo dieu) or (thuoc dieu)) hanh - hanh trinh ((va hang) or (va lang)) cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo dieu) OR (thuoc dieu)) hanh - hanh trinh ((va hang) OR (va lang)) cong tan van ban.
• Adding a wildcard symbol may retrieve word variants: ((theo dieu) or (thuoc dieu)) hanh - hanh trinh ((va hang) or (va lang)) cong tan van ban*.