Perhaps you should try some spelling variations:
dinh toai » dinh toi, tinh toan, dinh tri
dinh tai » dinh tri, dinh thi, hinh tai
bo sach » co sach, hoc sach
sach ly » sach y, sach lo, sach ty
cac tuc » cac toc, cac tu, cac tac
cuu tre » cua tre, cau tren, cau treo
hang xa » hoang xa, hang ca, lang xa
hieu ve » hieu va, hieu van
tuc va » thuc va, truc va, tuc xa
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: bo sach ly ((hang xa) or (hang va)) hoi. hieu ve cac tuc va ((dinh tai) OR (dinh toai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ly ((hang xa) OR (hang va)) hoi. hieu ve cac tuc va ((dinh tai) OR (dinh toai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ly ((hang xa) or (hang va)) hoi. hieu ve cac tuc va ((dinh tai) OR (dinh toai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: bo sach ly ((hang xa) or (hang va)) hoi. hieu ve cac tuc va ((dinh tai) OR (dinh toai)) cuu tre*.