Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hieu ve » hieu va
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ma hoi. ((hieu ve) OR (hieu van)) tham thuc va thanh vi ((dua tren) OR (cuu tre))~.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ma hoi. ((hieu ve) or (hieu van)) tham thuc va thanh vi ((dua tren) or (cuu tre))*.