Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu sach » tu sach, thuat sach, thuoc sach
bieu cua » dieu cua, hieu cua, ben cua
tam thuc » tham thuc, am thuc, nam thuc
va triet » va thiet, va trien, ve triet
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi va » vi van, vai va, vu va

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) or (thu sach)) ky tang ma hoa. bieu cua tam thuc va danh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) ky tang ma hoa. bieu cua tam thuc va danh vi va triet.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) ky tang ma hoa. bieu cua tam thuc va danh vi va triet*.