Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
thanh vi » hanh vi, thanh va, thanh ve
va triet » va thiet, va trien, ve triet
tu cach » tu cac
bo sach » co sach, hoc sach
tai hoi » tai khoi, dai hoi, tai hai
hieu vi » hieu voi, hieu va, hieu ve
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
vi va » vi van, vai va, vu va
pham » phan

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) or (bo sach)) ky nang tai hoi. hieu vi pham ((duc ban) OR (duc van)) thanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (bo sach)) ky nang tai hoi. hieu vi pham ((duc ban) OR (duc van)) thanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (bo sach)) ky nang tai hoi. hieu vi pham ((duc ban) OR (duc van)) thanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (bo sach)) ky nang tai hoi. hieu vi pham ((duc ban) OR (duc van)) thanh vi va triet*.