Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
van hang » van khang, van hoang, van thang
cong ban » cong bang, cong san, cong tan
ban toan » bai toan, ban than, van toan
toan cau » toan cao, toan ban, toan tap
va hang » va nang, va lang, va hanh

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 - canh tranh ((va hang) OR (van hang)) cong ban toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh tranh ((va hang) OR (van hang)) cong ban toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh ((va hang) OR (van hang)) cong ban toan cau*.