Perhaps you should try some spelling variations:
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
theo yeu » theo tieu, thiet yeu, theo chu
luan han » luan hoan, luan phan, luan van
han nong » hang nong, han tong, phan cong
nong dan » cong dan, nong san, nguong dan
toan cao » toan tap
toan ban » van ban
yeu tin » yeu tan, hieu tin, lieu tin

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo yeu tin - hanh tang luan han nong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo yeu tin - hanh tang luan han nong dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo yeu tin - hanh tang luan han nong dan ((toan cao) or (toan ban))*.