Perhaps you should try some spelling variations:
qua pham » quan pham, quy pham, qua cham
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
banh d » anh d
x hoi » xa hoi, o hoi, x ho
binh » dinh, minh, kinh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty nang) OR (ty hang)) x hoi. hieu qua pham duc tan ((banh d) or (binh d)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) x hoi. hieu qua pham duc tan ((banh d) OR (binh d)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty hang)) x hoi. hieu qua pham duc tan ((banh d) or (binh d)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty hang)) x hoi. hieu qua pham duc tan ((banh d) or (binh d)) cua tre*.