Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan danh » van danh, han danh, ban danh
hoc sac » hoc sach, hoc cac, hoc mac
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
danh va » doanh va, hanh va, anh va
ca tren » cau tren, cu tren, la tren
sac ky » cac ky, sai ky
va cau » van cau, va cac, va dau
va ca » va cac, va cao, va cai

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) or (lang xa)) hoi. hieu va cau thuc dan danh va ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky ((nang xa) OR (lang xa)) hoi. hieu va cau thuc dan danh va ca tren.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky ((nang xa) or (lang xa)) hoi. hieu va cau thuc dan danh va ca tren*.