Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu cao » chieu cao, hieu cac, hieu ca
hieu luc » hieu luat, hieu qua
cau thuc » cau truc, cuu thuc, can thuc
danh dai » danh dau, danh di, danh sai
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
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: thuoc sach y nang xa hoi. ((hieu cao) or (hieu luc)) cau thuc va danh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang xa hoi. ((hieu cao) OR (hieu luc)) cau thuc va danh dai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang xa hoi. ((hieu cao) or (hieu luc)) cau thuc va danh dai ((cua tre) or (cua te))*.