Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, hieu ca
te sach » toc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
cua tre » cuu tre, cua triet, dua tren
xuc va » tuc va, luc va, xac va
dan vi » doan vi, don vi, dan va
cua te » cua tu

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