Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
hanh dung » thanh dung, anh dung, manh dung
hanh dong » anh dong, ha dong
luan cong » luat cong, luong cong, luan chung
luong dan » luong dao, luong van, tuong dan
doc lieu » duoc lieu, doc hieu, du lieu
than cau » toan cau, phan cau, than cap

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: doc lieu tinh - ((hanh dung) OR (hanh dong)) luan cong ((luong dan) OR (huong dan)) than cau~.
• Adding a wildcard symbol may retrieve word variants: doc lieu tinh - ((hanh dung) or (hanh dong)) luan cong ((luong dan) or (huong dan)) than cau*.