Perhaps you should try some spelling variations:
thuc may » thuc day, truc may, phuc may
su sach » so sach, vu sach
tinh va » tich va, trinh van, trinh vat
co thuc » do thuc, co thua, mo thuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cua » va chua, via cua, ca cua

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) or (vu bach)) ky lang xa hoi. ((hieu ve) or (hieu va)) co thuc may tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) ky lang xa hoi. ((hieu ve) OR (hieu va)) co thuc may tinh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu bach)) ky lang xa hoi. ((hieu ve) or (hieu va)) co thuc may tinh va cua tre*.