Perhaps you should try some spelling variations:
cham duc » pham duc, pham duy, phan duc
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua dieu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu ve ((cham duc) or (cham soc)) van hanh lai ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve ((cham duc) OR (cham soc)) van hanh lai ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve ((cham duc) or (cham soc)) van hanh lai ((cua viet) or (cua vat))*.