Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
nang ma » tang ma, sang ma, nang cao
lang ha » long ha
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
minh vi » minh voi, dinh vi, minh va
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
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: bo sach y ((((nang ma) or (nang x))) or (lang ha)) hoi. hieu ve cam xuc van minh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y ((((nang ma) OR (nang x))) OR (lang ha)) hoi. hieu ve cam xuc van minh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: bo sach y ((((nang ma) or (nang x))) or (lang ha)) hoi. hieu ve cam xuc van minh vi cua tre*.