Perhaps you should try some spelling variations:
lanh hai » manh hai, thanh hai, lang chai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tay hoi » tay ho, tay thai
tao hoi » tao khoi, tao boi, thao hoc
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc ban » duc van, dua ban, duc man
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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