Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cac thuc » cach thuc, cac thu, can thuc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cuu tre, cua triet, dua tren
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: hoc sach ky nang xa hoi. hieu ve cac thuc ((va danh) or (va hanh)) dai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. hieu ve cac thuc ((va danh) OR (va hanh)) dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. hieu ve cac thuc ((va danh) or (va hanh)) dai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu ve cac thuc ((va danh) or (va hanh)) dai ((cua tre) OR (cua te))*.