Perhaps you should try some spelling variations:
hoc nghien » hoc hien
hoc thuyet » hoc chuyen
hanh trang » thanh trung, canh tranh, hanh trinh
trang cua » tranh cua, tang cua, trung cua
tong cong » trong cong, cong cong, dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
cua tong » cua cong, cua dong, cua nong
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan man » chan nan, than man, chan doan

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 nghien) OR (hoc thuyet))) OR (ho chieu)) tach - hanh trang cua tong cong dan chan man~.
• Adding a wildcard symbol may retrieve word variants: ((((hoc nghien) or (hoc thuyet))) or (ho chieu)) tach - hanh trang cua tong cong dan chan man*.