Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
phap thuc » phap thu, phap hoc, phap tu
thu tang » thu trang, thu thang, thu bang
thu hang » thi hang, thuc hanh, thu huong
thuc day » thuc dan, thuc vat
thanh va » thanh van, hanh va, thanh ha
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va phap » va phat, ban phap
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((thu tang) or (thu hang)) ma hoa. hieu va phap thuc day thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu tang) OR (thu hang)) ma hoa. hieu va phap thuc day thanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((thu tang) or (thu hang)) ma hoa. hieu va phap thuc day thanh va cua tre*.