Perhaps you should try some spelling variations:
sach tham » sach nha
tham lang » nham nang, pham hang, thai bang
cau theo » cau thi, cau tao
xanh di » danh di, vanh dai, xanh tai
va xanh » va danh, va hanh, va anh
cach tu » cach thuc
te sach » toc sach
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
cac tu » cac thu, cac du, tac tu
ha hoi » ha noi, xa hoi, va hoi
di cau » da cau, diem cau

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