Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
sach lo » sach dao, sach doi, sach moi
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, mang xa
soc va » hoc va, loc va, doc va
va dao » ca dao
dao vi » dao voi, dao ve, dao va
vi cua » vai cua, di cua

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 lo) OR (sach hoi)) ((nang xa) or (nang ma)) hoi. hieu vu cham soc va dao vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach lo) OR (sach hoi)) ((nang xa) OR (nang ma)) hoi. hieu vu cham soc va dao vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach lo) OR (sach hoi)) ((nang xa) or (nang ma)) hoi. hieu vu cham soc va dao vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach lo) OR (sach hoi)) ((nang xa) or (nang ma)) hoi. hieu vu cham soc va dao vi cua tre*.