Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
bien bach » vien bach, bien dich, dien sach
bach thuc » cach thuc, bach thu, thach thuc
va thanh » gia thanh, ban thanh, va tinh
thanh de » hanh de, thanh ve, thanh do
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. thieu bien bach thuc va thanh de ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ma hoi. thieu bien bach thuc va thanh de ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. thieu bien bach thuc va thanh de ((cua tre) or (cuu tre))*.