Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
thu sach » tu sach, thuat sach, thuoc sach
lang van » dang van, tang van, hoang van
cac phuc » cau phuc, khac phuc, cac thu
cau theo » cau thi, cau tao
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
vi cau » va cau, ve cau, di cau

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang xa) OR (lang van)) hoi. hieu ve ((cac phuc) OR (cach thuc)) va hanh vi cau theo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((lang xa) or (lang van)) hoi. hieu ve ((cac phuc) OR (cach thuc)) va hanh vi cau theo~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang xa) or (lang van)) hoi. hieu ve ((cac phuc) OR (cach thuc)) va hanh vi cau theo*.