Perhaps you should try some spelling variations:
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
hanh di » hanh vi, hanh de, hang di
hieu va » lieu va, hieu qua
te sach » toc sach
ty hang » ly hang, thi hang, thu hang
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
ty ang » ty anh
di cuu » di cau, di cua, dinh cuu

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