Perhaps you should try some spelling variations:
hoc nhiet » hoc nghien, hoc hien, hoc viet
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh tang » hanh trang, anh tang, hanh mang
tong cong » trong cong, cong cong, dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
tang cua » mang cua, hang cua, tang luan
cua tong » cua cong, cua dong, cua nong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than man » than ma, thanh san, tran manh

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 nhiet) OR (hoc thiet))) OR (ho chieu)) tach - hanh tang cua tong cong dan than man~.
• Adding a wildcard symbol may retrieve word variants: ((((hoc nhiet) or (hoc thiet))) or (ho chieu)) tach - hanh tang cua tong cong dan than man*.