Perhaps you should try some spelling variations:
minh hai » minh khai, tinh hai, manh hai
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, duc man
hai cua » thai cua, dai cua, hoi cua
dua ban » dia ban, cua ban, qua ban
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
tay hoi » tay ho, tao hoi, tay thai
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang

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 ((y nang) OR (ly nang)) tay hoi. hieu ve pham ((duc ban) or (dua ban)) minh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) tay hoi. hieu ve pham ((duc ban) OR (dua ban)) minh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) tay hoi. hieu ve pham ((duc ban) or (dua ban)) minh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ly nang)) tay hoi. hieu ve pham ((duc ban) or (dua ban)) minh hai cua tre*.