Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, hieu ca
sach vu » sach tu, sach uu, sach xu
sach va » sach xa, sach ha, sach dao
dang xa » dang xay, lang xa, dang ha
cua tre » cua te, cuu tre, cua triet
luc va » tuc va, loc va
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: te ((sach vu) OR (sach va)) dang xa hoi. hieu cao chat ((luc va) or (duc va)) dao vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach vu) OR (sach va)) dang xa hoi. hieu cao chat ((luc va) OR (duc va)) dao vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach vu) OR (sach va)) dang xa hoi. hieu cao chat ((luc va) or (duc va)) dao vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach vu) OR (sach va)) dang xa hoi. hieu cao chat ((luc va) or (duc va)) dao vi cua tre*.