Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
va cam » va cham, va cac, va cao
va dan » ca dan, va dao, va dau
x hoi » xa hoi, o hoi, 5 hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((x hoi) OR (x ho)). lieu va cam tuc ((va hanh) or (va dan)) tai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x hoi) OR (x ho)). lieu va cam tuc ((va hanh) OR (va dan)) tai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((x hoi) OR (x ho)). lieu va cam tuc ((va hanh) or (va dan)) tai cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) OR (x ho)). lieu va cam tuc ((va hanh) or (va dan)) tai cua viet*.