Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
ton thien » toan thiet, doan thien, tran thien
tong cong » trong cong, cong cong, dung cong
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
toan cao » toan tap
toan ban » van ban
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ton thien) OR (hoan thien)) manh - hanh trinh va tong cong san ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ton thien) OR (hoan thien)) manh - hanh trinh va tong cong san ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ton thien) OR (hoan thien)) manh - hanh trinh va tong cong san ((toan cao) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ((ton thien) OR (hoan thien)) manh - hanh trinh va tong cong san ((toan cao) or (toan ban))*.