Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
su sach » so sach, vu sach
ty hang » ly hang, thi hang, thu hang
hieu ve » hieu va, hieu van
thuc ca » thuc cua, thuc can, thuc cao
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
ca dan » cac dan, ca dao
dan va » doan va, dan ca, ban va
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty hang) or (ty xang)) xa hoi. hieu ve cam thuc ca dan va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ty xang)) xa hoi. hieu ve cam thuc ca dan va cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (ty xang)) xa hoi. hieu ve cam thuc ca dan va cuu tre*.