Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
hoc sac » hoc sach, hoc cac, hoc mac
nang xa » nang x, lang xa, nang ma
qua cau » quan cau, qua cac, qua ca
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
sac ky » cac ky, sai ky
va cau » van cau, va cac, va dau
va cu » va chu, va su, va 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 sac ky nang xa hoi. hieu qua cau thuc va danh ((va cu) OR (va cau)) tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky nang xa hoi. hieu qua cau thuc va danh ((va cu) OR (va cau)) tren".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang xa hoi. hieu qua cau thuc va danh ((va cu) OR (va cau)) tren*.