Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
te sach » toc sach
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
cau tre » cau tren, cau treo, cau tra
nang o » nang co, nang ho, nang ro
di cau » da cau, diem cau
o hai » co hai, so hai, o lai

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 (so sach)) ky nang o hai. hieu ve cham thuc va thanh di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sach)) ky nang o hai. hieu ve cham thuc va thanh di cau tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sach)) ky nang o hai. hieu ve cham thuc va thanh di cau tre*.