Perhaps you should try some spelling variations:
chan thuc » nhan thuc, can thuc, phan thuc
cua triet » cua viet, su triet, va triet
thanh vi » thanh va, thanh ve, nhanh vi
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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 xa hoi. ((hieu va) OR (lieu va)) chan thuc va ((thanh vi) or (hanh vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. ((hieu va) OR (lieu va)) chan thuc va ((thanh vi) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. ((hieu va) OR (lieu va)) chan thuc va ((thanh vi) or (hanh vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. ((hieu va) OR (lieu va)) chan thuc va ((thanh vi) or (hanh vi)) cua triet*.