Perhaps you should try some spelling variations:
tu cach » tu cac
cach tu » cach thuc
tu nang » tru nang, tu nong, tu nano
ve pham » v pham, ve phan, ve phat
duc ban » duc tan, duc van, dua ban
ban anh » ban hanh, ban banh, ban danh
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
cua su » qua su
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach tu nang o hoi. hieu ((ve pham) or (vi pham)) duc ban anh d ((cua tre) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu nang o hoi. hieu ((ve pham) OR (vi pham)) duc ban anh d ((cua tre) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: tu cach tu nang o hoi. hieu ((ve pham) or (vi pham)) duc ban anh d ((cua tre) or (cua su))*.