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