Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
toc sach » hoc sach, doc sach, thuoc sach
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ve phap » va phap, de phap, ve phan
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
xay hoi » tay hoi, cay phoi, gay thoi
ky dang » ky nang, ky danh
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 dang ((xay hoi) or (xa hoi)). hieu ve phap thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (toc sach)) ky dang ((xay hoi) OR (xa hoi)). hieu ve phap thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (toc sach)) ky dang ((xay hoi) or (xa hoi)). hieu ve phap thuc va hanh vi cua tre*.