Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
danh xay » dang xay, manh xay, anh xay
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
vu sach » vu bach, su sach, vu khach
ky danh » ky anh, ky dang
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (toc sach)) ky danh xay hoi. hieu va pham thuc day hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (toc sach)) ky danh xay hoi. hieu va pham thuc day hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (toc sach)) ky danh xay hoi. hieu va pham thuc day hanh vi cua tre*.