Perhaps you should try some spelling variations:
thanh tung » thanh cong
tieu tinh » trieu tinh, tieu trinh, lieu tinh
anh quang » anh xquang, anh quan, nhanh quang
luan nang » luan van, van nang, luan san
nang nong » nang song, hang nong, nang dong
nong san » cong san, dong san, nong dan
san toan » van toan, dan toan, manh toan
toan ban » van ban

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 tinh - ((thanh tung) or (anh quang)) luan nang nong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu tinh - ((thanh tung) OR (anh quang)) luan nang nong san toan ban.
• Adding a wildcard symbol may retrieve word variants: theo tieu tinh - ((thanh tung) or (anh quang)) luan nang nong san toan ban*.