Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
thanh va » thanh van, hanh va, thanh ha
cac thuc » cach thuc, cac thu, can thuc
thuc day » thuc dan, thuc vat
bo sach » co sach, hoc sach
ty nang » ky nang, ty hang, ly nang
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ((ty nang) OR (ty xang)) xa hoi. hieu ve cac thuc day thanh va ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ((ty nang) OR (ty xang)) xa hoi. hieu ve cac thuc day thanh va ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ((ty nang) OR (ty xang)) xa hoi. hieu ve cac thuc day thanh va ((cua tre) or (cua te))*".