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