Perhaps you should try some spelling variations:
vat danh » va danh, van danh, luat danh
cam thuc » am thuc, nam thuc, can thuc
su sach » so sach, vu sach
danh vi » hanh vi, dinh vi, danh di
cam thu » nam thu, cac thu, ca thu
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sanh » do sanh
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: ((su sach) or (so sanh)) ky lang xa hoi. hieu va ((cam thuc) OR (cam thu)) vat danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky lang xa hoi. hieu va ((cam thuc) OR (cam thu)) vat danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ky lang xa hoi. hieu va ((cam thuc) OR (cam thu)) vat danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ky lang xa hoi. hieu va ((cam thuc) OR (cam thu)) vat danh vi cua tre*.