Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
dinh cuu » dinh chi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
di cuu » di cau, di cua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach thieu)) xang xa hoi. hieu va cam thuc va hanh ((di cuu) OR (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thieu)) xang xa hoi. hieu va cam thuc va hanh ((di cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach thieu)) xang xa hoi. hieu va cam thuc va hanh ((di cuu) OR (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach thieu)) xang xa hoi. hieu va cam thuc va hanh ((di cuu) OR (dinh cuu)) tre*.