Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua duong » cua dong, cua huong, qua duong
chua dong » cua dong, ha dong, huy dong
trong dan » trong dang, trong san, trong tan
hoc hieu » hoc thieu, hoc hien, doc hieu
dan phan » doan phan, dan chan, van 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 ((cua duong) or (chua dong)) trong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh ((cua duong) OR (chua dong)) trong dan phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh ((cua duong) or (chua dong)) trong dan phan cau*.