Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
va thanh » gia thanh, ban thanh, va tinh
vu cham » va cham, vu kham, tu cham
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va danh, ban hanh
tu sach » thu sach, te sach, tu cach
hieu vu » hieu va, hieu ve, hieu su
su sach » so sach, vu sach
cua te » cua tu
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) or (su sach)) ky nang x hoi. hieu vu cham tuc ((va hanh) OR (va thanh)) tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu vu cham tuc ((va hanh) OR (va thanh)) tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. hieu vu cham tuc ((va hanh) OR (va thanh)) tai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu vu cham tuc ((va hanh) OR (va thanh)) tai cua te*.