Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
trinh mat » trinh vat, trinh may, trinh mau
mat thong » suat thong, xuat thong, mang thong
doc hieu » hoc thieu, hoc hien
dan toan » van toan, dan than, manh toan
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) OR (toc thieu)) tinh - hanh trinh mat thong cong ((dan toan) or (van tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - hanh trinh mat thong cong ((dan toan) OR (van tuan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (toc thieu)) tinh - hanh trinh mat thong cong ((dan toan) or (van tuan)) ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (toc thieu)) tinh - hanh trinh mat thong cong ((dan toan) or (van tuan)) ban*.