Perhaps you should try some spelling variations:
thua thien » thuc hien
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
long ha » dong ha, cong ha, dong hoa
ky long » ky cong, sy long, ky trong
va cam » va cham, va cac, va cao
ha hoi » hoa hoi, ha noi, xa hoi

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 long ha hoi. hieu ((ve cham) or (va cam)) thuc va hanh vi ((cuu tre) or (thua thien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky long ha hoi. hieu ((ve cham) OR (va cam)) thuc va hanh vi ((cuu tre) OR (thua thien)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky long ha hoi. hieu ((ve cham) or (va cam)) thuc va hanh vi ((cuu tre) or (thua thien))*.