Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, cau treo
sach tay » xach tay, sach hay, sach nay
cam thuc » am thuc, nam thuc, cam thu
tay tang » tay lang, tay trung, tay quang
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ca tren » cu tren, la tren, co tren
ma hoi » mai hoi, xa hoi, ma hoa
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: toc sach tay tang ma hoi. hieu va cam thuc va hanh va ((cau tren) OR (ca tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tay tang ma hoi. hieu va cam thuc va hanh va ((cau tren) OR (ca tren))".
• Adding a wildcard symbol may retrieve word variants: toc sach tay tang ma hoi. hieu va cam thuc va hanh va ((cau tren) OR (ca tren))*.