Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thiet anh » thien anh, thuyet anh, thien danh
hanh dung » thanh dung, hanh dong, manh dung
luan hang » luan nang, luan han, luan hung
hang nong » thang long, han tong
anh dung » anh dong, anh huong, sach dung
nong dan » cong dan, nong san, nguong dan
phan cau » phan dau, phan cac, phan lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet anh - ((hanh dung) or (anh dung)) luan hang nong dan ((phan cau) OR (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet anh - ((hanh dung) OR (anh dung)) luan hang nong dan ((phan cau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet anh - ((hanh dung) or (anh dung)) luan hang nong dan ((phan cau) OR (phan tu))".
• Adding a wildcard symbol may retrieve word variants: hoc thiet anh - ((hanh dung) or (anh dung)) luan hang nong dan ((phan cau) OR (phan tu))*.