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