Perhaps you should try some spelling variations:
dieu cua » dieu tra
dao dieu » da dieu, dao hieu, cao dieu
sach ly » sach y, sach ty, sach hay
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sach lo » sach dao, sach doi, sach hoi
ve cac » va cac, vien cac
va dao » ca dao
ve cam » ve cham, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ly) or (sach lo)) nang xa hoi. hieu ((ve cam) or (ve cac)) duc va dao dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ly) OR (sach lo)) nang xa hoi. hieu ((ve cam) OR (ve cac)) duc va dao dieu cua tre.
• Adding a wildcard symbol may retrieve word variants: vu ((sach ly) or (sach lo)) nang xa hoi. hieu ((ve cam) or (ve cac)) duc va dao dieu cua tre*.