Perhaps you should try some spelling variations:
anh giao » nang giao, minh giao, danh gia
anh giau » canh giac, anh giang, danh giao
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
y tang » ky tang, 6 tang, 7 tang
cac so » cac co, cac bo, cac ho
so van » su van, vo van
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac

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 y tang ((ma hoi) or (xa hoi)). hieu ve cac so van ((anh giau) or (anh giao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y tang ((ma hoi) OR (xa hoi)). hieu ve cac so van ((anh giau) OR (anh giao)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y tang ((ma hoi) or (xa hoi)). hieu ve cac so van ((anh giau) or (anh giao)) cua tre*.