Perhaps you should try some spelling variations:
hoc thien » hoc hien, hoc thieu, hoc tien
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh dung » thanh dung, anh dung, hanh dong
luan nang » luan van, van nang, luan san
nong dan » nong san, nguong dan, huong dan
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan tu

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

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