Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
toc sach » hoc sach, doc sach, thuoc sach
thu sach » tu sach, thuat sach, thuoc sach
qua tham » qua cham, qua than, qua thanh
va thanh » gia thanh, ban thanh, va tinh
thanh do » thanh de, thanh pho, thanh hoa
va triet » va thiet, va trien, ve triet
thuc va » thuc vat, thuc dan, thuc day
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
do va » do van, so va

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) or (toc sach))) or (thu sach)) y nang x hoi. hieu qua tham thuc va thanh do va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((te sach) OR (toc sach))) OR (thu sach)) y nang x hoi. hieu qua tham thuc va thanh do va triet.
• Adding a wildcard symbol may retrieve word variants: ((((te sach) or (toc sach))) or (thu sach)) y nang x hoi. hieu qua tham thuc va thanh do va triet*.