Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
sach ty » sach y, sach tu, sach thu
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
cac thu » cach thuc, cac thoi
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
ca thu » cam thu, ca tru, va thu
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: so sach ty nang x hoi. hieu va ((ca thu) OR (cac thu)) va danh va ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang x hoi. hieu va ((ca thu) OR (cac thu)) va danh va ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang x hoi. hieu va ((ca thu) OR (cac thu)) va danh va ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang x hoi. hieu va ((ca thu) OR (cac thu)) va danh va ((cua triet) or (va triet))*.