Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
thuc ca » thuc cua, thuc can, thuc cao
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
ty nang » ky nang, ty hang, ty nong
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
ca dan » cac dan, ca dao

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 nang) OR (ly nang))) or (ty xang)) xa hoi. hieu ve cam thuc ca dan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((ty nang) OR (ly nang))) OR (ty xang)) xa hoi. hieu ve cam thuc ca dan vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((((ty nang) OR (ly nang))) or (ty xang)) xa hoi. hieu ve cam thuc ca dan vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((((ty nang) OR (ly nang))) or (ty xang)) xa hoi. hieu ve cam thuc ca dan vai cua tre*.