Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
dan thi » dang thi, tran thi, dinh thi
cuu tre » cua tre, cau treo
xuc va » tuc va, luc va, xac 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 ky dang xa hoi. hieu van nam ((xuc va) OR (duc va)) dan thi ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xa hoi. hieu van nam ((xuc va) OR (duc va)) dan thi ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xa hoi. hieu van nam ((xuc va) OR (duc va)) dan thi ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xa hoi. hieu van nam ((xuc va) OR (duc va)) dan thi ((cuu tre) or (cau tren))*.