Perhaps you should try some spelling variations:
tang nguoi » thang nguoi, tang nguon, nang nguoi
tac nguoi » toc nguoi, thuc nguoi, tich nguoi
manh duoc » hanh duoc, nganh duoc, doanh duoc
tay nguoi » toc nguoi, dao nguoi
hanh hoc » thanh hoc, hinh hoc, anh hoc
le nguoi » ly nguoi, lam nguoi, den nguoi
tu hanh » du hanh, lu hanh, thuc hanh
tu manh » tu minh, vu manh, tung manh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu hanh hoc ((tang nguoi) or (tac nguoi)) ) or ( tu manh duoc ((le nguoi) or (tay nguoi)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hanh hoc ((tang nguoi) OR (tac nguoi)) ) OR ( tu manh duoc ((le nguoi) OR (tay nguoi)) )).
• Adding a wildcard symbol may retrieve word variants: (( tu hanh hoc ((tang nguoi) or (tac nguoi)) ) or ( tu manh duoc ((le nguoi) or (tay nguoi)) ))*.