Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh trinh » canh tranh
doan thi » dan thi, doanh tai, hoang thi
thi manh » thi hanh, thi minh, thi anh
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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 manh - ((hanh trinh) or (hanh chinh)) va thong cong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doan thi manh - ((hanh trinh) OR (hanh chinh)) va thong cong dan than tap.
• Adding a wildcard symbol may retrieve word variants: doan thi manh - ((hanh trinh) or (hanh chinh)) va thong cong dan than tap*.