Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
hanh dai » hanh tai, hanh dao, thanh dat
sach ky » sac ky, sach y, sach ty
te sach » toc sach
va chat » van chat, va phat, hoa chat
huu tre » huu tri, cuu tre, huu them
xuc va » duc va, tuc va, luc va
nang o » nang co, nang ho, nang ro
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: te sach ky nang o hoi. hieu ((va chat) OR (cao chat)) xuc va ((hanh dai) or (vanh dai)) huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang o hoi. hieu ((va chat) OR (cao chat)) xuc va ((hanh dai) OR (vanh dai)) huu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang o hoi. hieu ((va chat) OR (cao chat)) xuc va ((hanh dai) or (vanh dai)) huu tre*".