Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
va vanh » va van, va danh, va anh
va hanh » van hanh, va thanh, va danh
van am » van nam, van lam, van dam

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