Perhaps you should try some spelling variations:
dinh toai » dinh toi, dinh tai, tinh toan
toai cua » thai cua, toan cua, loai cua
dang xay » dang van, van xay
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((lang xa) OR (dang xay)) hoi. hieu ve cham ((tuc va) or (tuc xa)) dinh toai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((lang xa) OR (dang xay)) hoi. hieu ve cham ((tuc va) OR (tuc xa)) dinh toai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((lang xa) OR (dang xay)) hoi. hieu ve cham ((tuc va) or (tuc xa)) dinh toai cua tre*".