Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
tu sac » tu cac, tu san, tu bac
vi cua » vai cua, di cua
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 sac) OR (tu sach)) ky nang x hoi. hieu ve ((cao duc) or (cao su)) va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky nang x hoi. hieu ve ((cao duc) OR (cao su)) va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu sach)) ky nang x hoi. hieu ve ((cao duc) or (cao su)) va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu sach)) ky nang x hoi. hieu ve ((cao duc) or (cao su)) va hanh vi cua te*.