Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
va hanh » van hanh, va thanh, va danh
cau xuc » cam xuc, cau luc, chat xuc
su sach » so sach, vu sach
xang xa » lang xa, mang xa, ang xa
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: su sach thu ((xang xa) or (mang may)) hoi. hieu van ((cau xuc) OR (cau truc)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((xang xa) OR (mang may)) hoi. hieu van ((cau xuc) OR (cau truc)) va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((xang xa) or (mang may)) hoi. hieu van ((cau xuc) OR (cau truc)) va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((xang xa) or (mang may)) hoi. hieu van ((cau xuc) OR (cau truc)) va hanh vi cua tre*.