Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
cac thuc » cach thuc, cac thu, can thuc
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang xa hoi. ((hieu ve) OR (hieu va)) cac thuc va hanh di ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. ((hieu ve) OR (hieu va)) cac thuc va hanh di ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. ((hieu ve) OR (hieu va)) cac thuc va hanh di ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. ((hieu ve) OR (hieu va)) cac thuc va hanh di ((cua triet) or (va triet))*.