Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
te sach » toc sach
bac tuc » bac tu, bach tuoc, bac thua
xa hanh » xa thanh, xa khanh, da hanh
va hanh » van hanh, va thanh, va danh
kem cua » em cua, keo cua, diem cua
va bac » van bac, va cac, va bai
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: ((su sach) or (te sach)) ky nang x hoi. lieu va bac tuc ((xa hanh) OR (va hanh)) kem cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang x hoi. lieu va bac tuc ((xa hanh) OR (va hanh)) kem cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang x hoi. lieu va bac tuc ((xa hanh) OR (va hanh)) kem cua viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang x hoi. lieu va bac tuc ((xa hanh) OR (va hanh)) kem cua viet*.