Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
trong dan » trong dang, trong san, trong tan
cua dung » cua dang, cua dong, qua dung
phan dau » phan tu
hang dau » hang va
hang tai » hang va, dung tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - canh tranh cua dung trong dan ((phan dau) or (((hang dau) or (hang tai))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh tranh cua dung trong dan ((phan dau) OR (((hang dau) OR (hang tai)))).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh cua dung trong dan ((phan dau) or (((hang dau) or (hang tai))))*.