Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cac thuc » cach thuc, cac thu, can thuc
vanh dai » van dai, vanh tai, lanh dao
thuc day » thuc dan, thuc vat
hoc sach » hoc sinh, hoc cac, hoc anh
qua cac » cua cac
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hanh ve » hanh vi, hanh va, hanh kem
xanh di » danh di, xanh tai

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

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