Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
tri cuu » tri cua, tra cuu, trinh cuu
van han » van hanh, van phan, van nhan
hieu ve » hieu va, hieu van
hang ca » hang va, nang cao, hang tai
hang xa » hoang xa, hang va, lang xa
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
va han » va phan, va hanh, va hang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y ((hang xa) OR (hang ca)) hoi. hieu ve cam xuc ((va han) OR (van han)) tri cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach y ((hang xa) or (hang ca)) hoi. hieu ve cam xuc ((va han) OR (van han)) tri cuu tre~".
• Adding a wildcard symbol may retrieve word variants: bo sach y ((hang xa) or (hang ca)) hoi. hieu ve cam xuc ((va han) OR (van han)) tri cuu tre*.