Perhaps you should try some spelling variations:
dinh tai » dinh toai, dinh tri, dinh thi
cac loc » cac lop, cac toc, cac hoc
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
loc va » hoc va, luc va
sac ky » cac ky, sai ky

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 ky) OR (sac ky)) dang xa hoi. hieu ve cac loc va ((dinh tai) or (dinh van)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) dang xa hoi. hieu ve cac loc va ((dinh tai) OR (dinh van)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sac ky)) dang xa hoi. hieu ve cac loc va ((dinh tai) or (dinh van)) cuu tre*".