Perhaps you should try some spelling variations:
van chat » cao chat
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
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 ((van nam) or (van chat)) duc va hanh de cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ((van nam) OR (van chat)) duc va hanh de cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((van nam) or (van chat)) duc va hanh de cua viet*.