Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
qua duong » quan duong, qua dung, qua dong
trong dan » trong dang, trong san, trong tan
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dong » chua dong, cua cong, cua dang
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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