Perhaps you should try some spelling variations:
sach tham » sach nha
cau tren » cu tren, dau tren, ca tren
cuu tre » cua tre, cau treo
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
te sach » toc sach
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
cac tu » cac thu, cach tu, cac du

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 tham ((nang xa) OR (nang x)) hoi. hieu va cac tu va danh di ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tham ((nang xa) OR (nang x)) hoi. hieu va cac tu va danh di ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tham ((nang xa) OR (nang x)) hoi. hieu va cac tu va danh di ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach tham ((nang xa) OR (nang x)) hoi. hieu va cac tu va danh di ((cuu tre) or (cau tren))*.