Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thanh lai » thanh hai, thanh lap, thanh loi
thuc gia » thuc giai, thue gia, thuc dia
su sach » so sach, vu sach
sach cu » sach cua, sach tu, sach uu
hieu va » lieu va, hieu qua
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
cu lang » cua lang, tu lang, xu lang
cuu tre » cua tre, cau tren, cau treo
cua te » cua tu

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: su sach cu lang xa hoi. ((hieu ve) OR (hieu va)) pham thuc gia thanh lai ((cua te) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach cu lang xa hoi. ((hieu ve) OR (hieu va)) pham thuc gia thanh lai ((cua te) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach cu lang xa hoi. ((hieu ve) OR (hieu va)) pham thuc gia thanh lai ((cua te) or (cuu tre))*.