Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham
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) or (van xay)) hoi. hieu v pham 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) OR (van xay)) hoi. hieu v pham thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (toc sach)) ky ((dang xay) or (van xay)) hoi. hieu v pham thuc va hanh vi cua tre*.