Perhaps you should try some spelling variations:
dinh dieu » dinh dien, dinh tieu, vinh dieu
dieu cua » dieu tra
so cham » so kham, co cham, so chat
hieu so » thieu so
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach va, sach 2, sach vay
soc va » loc va, doc va, goc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach v) or (sach y)) nang ma hoi. hieu so cham ((soc va) or (hoc va)) dinh dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach y)) nang ma hoi. hieu so cham ((soc va) OR (hoc va)) dinh dieu cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang ma hoi. hieu so cham ((soc va) or (hoc va)) dinh dieu cua tre*.