Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tang mai » tang ma, tang tai, lang mai
anh giau » canh giac, anh giang, danh giao
anh giao » nang giao, minh giao, danh gia
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
y tang » ky tang, 6 tang, 7 tang
ve cac » va cac, vien cac
cac vo » cac co, cac vi, cac bo

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y tang mai hoi. hieu ve cac vo van ((anh giau) or (anh giao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y tang mai hoi. hieu ve cac vo van ((anh giau) OR (anh giao)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y tang mai hoi. hieu ve cac vo van ((anh giau) or (anh giao)) cua tre*.