Perhaps you should try some spelling variations:
caou thuc » choi thuc, cach thuc, cuu thuc
cao tren » ca tren, cau tren, co tren
van danh » van doanh, van anh, van hanh
dan danh » han danh, ban danh, dai danh
hoc sac » hoc sach, hoc cac, hoc mac
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
va caou » va cau
sac ky » cac ky, sai ky
va cao » va cac, va co, va dao

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 caou thuc ((dan danh) or (van danh)) va cao 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 caou thuc ((dan danh) OR (van danh)) va cao tren.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky ((nang xa) or (lang xa)) hoi. hieu va caou thuc ((dan danh) or (van danh)) va cao tren*.