Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
thuc gia » thuc giai, thue gia, thuc dia
thanh di » thanh doi, thanh de, thanh do
so sach » so sanh, bo sach, co sach
hieu va » hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
di cua » dai cua, doi cua, de cua

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 ((y nang) OR (ky nang)) xa hoi. ((hieu va) or (lieu va)) cach thuc gia thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (ky nang)) xa hoi. ((hieu va) OR (lieu va)) cach thuc gia thanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y nang) OR (ky nang)) xa hoi. ((hieu va) or (lieu va)) cach thuc gia thanh di cua tre*".