Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua dieu
nang mai » nang ma, nang tai, nang cai
lang mai » lang dai, lang hai, lang man
cam thuc » am thuc, nam thuc, cam thu
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
sach va » sach xa, sach ha, sach dao
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach va ((nang mai) OR (lang mai)) hoi. hieu ve cam thuc va hanh vi ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach va ((nang mai) OR (lang mai)) hoi. hieu ve cam thuc va hanh vi ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach va ((nang mai) OR (lang mai)) hoi. hieu ve cam thuc va hanh vi ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: so sach va ((nang mai) OR (lang mai)) hoi. hieu ve cam thuc va hanh vi ((cua viet) or (cua vat))*.