Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dam thuc » am thuc, dan thuc, dai thuc
sach tay » xach tay, sach hay, sach nay
nam thuc » nam thuoc, am thuc, nam thu
tay tang » tay lang, tay trung, tay quang
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
va danh » va dinh, va hanh, dia danh
te sach » toc sach
va dan » ca dan, va dao, va dau
vi cau » va cau, ve cau, di cau

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 tay tang ma hoa. hieu va ((dam thuc) or (nam thuc)) ((va danh) OR (va dan)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tay tang ma hoa. hieu va ((dam thuc) OR (nam thuc)) ((va danh) OR (va dan)) vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tay tang ma hoa. hieu va ((dam thuc) or (nam thuc)) ((va danh) OR (va dan)) vi cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach tay tang ma hoa. hieu va ((dam thuc) or (nam thuc)) ((va danh) OR (va dan)) vi cau tren*.