Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh moi » thanh moi, hanh noi, hanh mot
pham duy » pham duc
cham duc » pham duc, cham soc, phan duc
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
nang o » nang co, nang ho, nang ro
moi va » hoi va, mai va, moi ve
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 sach ty nang o hoi. hieu ve ((cham duc) or (pham duy)) va hanh moi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoi. hieu ve ((cham duc) OR (pham duy)) va hanh moi va triet*.