Perhaps you should try some spelling variations:
hanh giau » thanh gian, danh gia, anh giao
giau cua » gian cua, gia cua, dieu cua
hieu van » hieu va, thien van, lieu va
van luat » dan luat, va luat, van xuat
sach thu » sach thue, sach thieu, sach tham
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, xach tay
thue va » thuyet va, thuc vat, thuat va
thuc va » thuc vat, thuc dan, thuc day
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: toc ((sach ty) or (sach thu)) lang xa hoi. hieu van luat ((thue va) OR (thuc va)) hanh giau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) lang xa hoi. hieu van luat ((thue va) OR (thuc va)) hanh giau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (sach thu)) lang xa hoi. hieu van luat ((thue va) OR (thuc va)) hanh giau cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach thu)) lang xa hoi. hieu van luat ((thue va) OR (thuc va)) hanh giau cua tre*.