Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
qua duong » quan duong, qua dung, qua dong
chua dong » cua dong, ha dong, huy dong
trong van » trong cac
hoc hieu » hoc thieu, hoc hien, doc hieu
van phan » van phong, van thanh, luan phan
phan cau » phan dau, phan cac, phan tu

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 ((qua duong) or (chua dong)) trong van phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh ((qua duong) OR (chua dong)) trong van phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh ((qua duong) or (chua dong)) trong van phan cau*.