Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
cau thuc » cau truc, cuu thuc, can thuc
hieu cao » chieu cao, hieu cac, hieu ca
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cao cau » cao cap, co cau, tao cau
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

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