Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
thanh ve » hanh ve, thanh va, thanh vien
thuc gia » thuc giai, thue gia, thuc dia
lang van » dang van, tang van, hoang van
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
va cach » va cac
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
su viet » so viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((lang xa) OR (lang van)) hoi. hieu va cach thuc gia thanh ve ((cuu tre) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((lang xa) OR (lang van)) hoi. hieu va cach thuc gia thanh ve ((cuu tre) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((lang xa) OR (lang van)) hoi. hieu va cach thuc gia thanh ve ((cuu tre) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((lang xa) OR (lang van)) hoi. hieu va cach thuc gia thanh ve ((cuu tre) or (su viet))*.