Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
trong san » trong cac, cong san, dong san
san thanh » ban thanh, van thanh, son thanh
thanh lap » thanh san, phan lap, thanh hai
nong dan » nong san, nguong dan, huong dan
cong dan » cong san, cong tan, huong dan
qua dung » quang dung, su dung, qua song

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 - ((nong dan) or (cong dan)) qua dung trong san thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((nong dan) OR (cong dan)) qua dung trong san thanh lap.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((nong dan) or (cong dan)) qua dung trong san thanh lap*.