Perhaps you should try some spelling variations:
dung nguoi » dung nguon, nhung nguoi
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cac » trinh cac, thanh cac, tranh cai
nguoi dao » nguoi tay
doc hieu » toc thieu, hoc thieu, hoc hien
cac dung » cach dung, cac duong, tac dung
than cap » khan cap, thanh lap, thanh cac
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 xanh - canh tranh cac dung nguoi dao ((than cap) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh cac dung nguoi dao ((than cap) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh cac dung nguoi dao ((than cap) or (phan cau))*.