Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
doan thi » doanh tai, hoang thi, doanh thu
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
cong tac » cong ty
toan cao » toan ban, toan tap
dan thi » dang thi, tran thi, dinh thi

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

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