Perhaps you should try some spelling variations:
thang cong » thanh cong, thang long, thong cong
hanh trung » thanh trung, hanh trang, manh trung
hieu manh » chieu xanh, hieu nganh, dieu hanh
nam thang » nam thanh, nam trong, nam trung
cong manh » cong danh, duong manh, cong thanh
hoc hieu » hoc thieu, hoc hien, doc hieu

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