Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thanh hoa » thanh pho
toc sach » hoc sach, doc sach, thuoc sach
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
cuu tre » cua tre, cau tren, cau treo
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) ly nang x hoi. hieu ve pham thuc va ((thanh hoa) or (hanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ly nang x hoi. hieu ve pham thuc va ((thanh hoa) OR (hanh va)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ly nang x hoi. hieu ve pham thuc va ((thanh hoa) or (hanh va)) cuu tre*.