Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
thang cong » thanh cong, thang long, thong cong
nam thang » nam thanh, nam trong, nam trung
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, hoc dieu
doc hieu » toc thieu, hoc thieu, hoc hien
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hieu) OR (doc hieu)) manh - ((hanh trung) or (canh tranh)) nam thang cong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (doc hieu)) manh - ((hanh trung) OR (canh tranh)) nam thang cong manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) OR (doc hieu)) manh - ((hanh trung) or (canh tranh)) nam thang cong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) OR (doc hieu)) manh - ((hanh trung) or (canh tranh)) nam thang cong manh toan ban*.