Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cua triet » cua viet, su triet, va triet
thuc gia » thuc giai, thue gia, thuc dia
gia hanh » gia thanh, giao hanh, gia anh
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va cach » va cac
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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 (v nang)) xa hoi. hieu va cach thuc gia hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (v nang)) xa hoi. hieu va cach thuc gia hanh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) or (v nang)) xa hoi. hieu va cach thuc gia hanh vi ((cua tre) or (cua triet))*.