Perhaps you should try some spelling variations:
sach tham » sach nha
cau theo » cau thi, cau tao
cau treo » cau tren, cau triet, cau trieu
xanh di » danh di, vanh dai, xanh tai
va xanh » va danh, va hanh, va anh
te sach » toc sach
long ha » dong ha, cong ha, dong hoa
hieu va » lieu va, hieu qua
du va » dau va, tu va, su 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 tham ((lang ha) or (long ha)) hoi. hieu va cac du va xanh di ((cau treo) OR (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tham ((lang ha) OR (long ha)) hoi. hieu va cac du va xanh di ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tham ((lang ha) or (long ha)) hoi. hieu va cac du va xanh di ((cau treo) OR (cau theo))".
• Adding a wildcard symbol may retrieve word variants: te sach tham ((lang ha) or (long ha)) hoi. hieu va cac du va xanh di ((cau treo) OR (cau theo))*.