Perhaps you should try some spelling variations:
doc trinh » doc tinh, doi trinh, hoc trinh
hanh dang » hanh dong, hanh dung, hanh mang
dung cong » dung trong
doi tinh » doi trinh, hoi tinh, don tinh
anh dang » anh dong, anh dung, anh bang
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
dan han » dan chan, dan than, dan hanh
han tap » han tai, toan tap, nhan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc trinh) or (doi tinh)) tinh - ((hanh dang) or (anh dang)) cua dung cong dan han tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc trinh) OR (doi tinh)) tinh - ((hanh dang) OR (anh dang)) cua dung cong dan han tap.
• Adding a wildcard symbol may retrieve word variants: ((doc trinh) or (doi tinh)) tinh - ((hanh dang) or (anh dang)) cua dung cong dan han tap*.