Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh lai » hanh lam, hanh tai, thanh lap
pham duy » pham duc
cham duc » pham duc, cham soc, phan duc
sach ty » sach tu, sach thu, xach tay
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
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: tu ((sach ty) or (sach y)) nang o hoi. hieu ve ((cham duc) or (pham duy)) va hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang o hoi. hieu ve ((cham duc) OR (pham duy)) va hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang o hoi. hieu ve ((cham duc) or (pham duy)) va hanh lai cua viet*.