Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, hieu ca
cay phoi » cap phoi, tay hoi, cay cho
chat huu » pham huu
sach tu » sach thu, cach tu, sach ty
te sach » toc sach
xay hoi » xa hoi, tay hoi, gay thoi
tu dang » thu dang, tu dong, su dang
cua tre » cua te, cuu tre, cua triet
huu va » cuu va, tuu va
dan di » danh di, dan de, dan li
dan da » dan dat, dan ca, dan 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 tu dang ((xay hoi) OR (cay phoi)). hieu cao chat huu va ((dan di) or (dan da)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu dang ((xay hoi) OR (cay phoi)). hieu cao chat huu va ((dan di) OR (dan da)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu dang ((xay hoi) OR (cay phoi)). hieu cao chat huu va ((dan di) or (dan da)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu dang ((xay hoi) OR (cay phoi)). hieu cao chat huu va ((dan di) or (dan da)) cua tre*.