Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
hanh van » thanh van, khanh van, hanh san
hieu van » hieu va, thien van, lieu va
sach thu » sach thieu, sach tham, cach thuc
xuc van » duc van, luc van, vuc van
hanh va » hang va, hanh vi
van cau » van dau, van hau, van chat
cau xuc » cam xuc, cau luc, cau truc
may hoi » may thoi, tay hoi, mai hoi
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thu) OR (sach thue)) mang may hoi. hieu van cau xuc van ((hanh van) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thue)) mang may hoi. hieu van cau xuc van ((hanh van) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach thue)) mang may hoi. hieu van cau xuc van ((hanh van) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach thue)) mang may hoi. hieu van cau xuc van ((hanh van) or (hanh va)) cua tre*.