Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
cam duc » cam xuc, cao duc, pham duc
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
di cua » dai cua, doi cua, de cua
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 (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cam duc va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cam duc va hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cam duc va hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cam duc va hanh di cua te*.