Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
luan nang » luan van, van nang, luan san
nang nong » nang song, hang nong, nang dong
nong dan » cong dan, nong san, nguong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man
anh son » anh dong, tinh son

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - ((anh son) or (anh huong)) luan nang nong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - ((anh son) OR (anh huong)) luan nang nong dan than ban*.