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