Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
nang ro » nang ho, nang ra, nang rong
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua cuc » cua cac, cua duc, cua tuc
qua am » quan am, qua ap, cua am
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang co) or (nang ro)) hoi. hieu qua am thuc va hanh vi ((cua cu) or (cua cuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang co) OR (nang ro)) hoi. hieu qua am thuc va hanh vi ((cua cu) OR (cua cuc)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang co) or (nang ro)) hoi. hieu qua am thuc va hanh vi ((cua cu) or (cua cuc))*.