Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
phan duc » pham duc, phan tu, phan dau
pham duy » pham duc
doi cua » dai cua, hoi cua
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ve ((phan duc) OR (pham duy)) ((va dan) OR (ca dan)) doi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ve ((phan duc) or (pham duy)) ((va dan) OR (ca dan)) doi cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve ((phan duc) or (pham duy)) ((va dan) OR (ca dan)) doi cua triet*.