Perhaps you should try some spelling variations:
cach thue » cach thuc, cach thien, cach thiet
sach thue » sach thu, sach thieu, sach tham
cua triet » cua viet, su triet, va triet
thanh vi » hanh vi, thanh va, thanh ve
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu va ((cach thue) OR (sach thue)) gia thanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang x hoi. hieu va ((cach thue) OR (sach thue)) gia thanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang x hoi. hieu va ((cach thue) OR (sach thue)) gia thanh vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: so sach y nang x hoi. hieu va ((cach thue) OR (sach thue)) gia thanh vi ((cua tre) or (cua triet))*.