Perhaps you should try some spelling variations:
tu sach » thu sach, te sach, tu cach
va vanh » va van, va hanh, va anh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
cao xuc » cam xuc, cao duc, cao suc
va cao » va cac, va co, va dao
cua te » cua tu

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 xa hoi. hieu va cao xuc ((va vanh) OR (va danh)) dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu va cao xuc ((va vanh) OR (va danh)) dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. hieu va cao xuc ((va vanh) OR (va danh)) dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu va cao xuc ((va vanh) OR (va danh)) dai cua te*.