Perhaps you should try some spelling variations:
thuyet tach » thuyet mach, thuyet hach, thuyet xac
tranh khong » trinh khong, tran hong, tranh hang
hoc thuyet » hoc chuyen
khong dung » thong dung, phuong dung, cuong dung
chat ran » chat ban, chat va
con dan » cong dan, con ban, con day
co dan » co ban, ca dan, cao dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuyet tach - canh tranh khong dung ((con dan) or (co dan)) chat ran~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuyet tach - canh tranh khong dung ((con dan) OR (co dan)) chat ran.
• Adding a wildcard symbol may retrieve word variants: hoc thuyet tach - canh tranh khong dung ((con dan) or (co dan)) chat ran*.