Perhaps you should try some spelling variations:
xay manh » day manh, van manh, ha manh
manh hai » lanh hai, minh hai, thanh hai
tu sach » thu sach, su sach, te sach
ky dang » ky danh
hieu ve » hieu va, hieu van
nam tuc » nam thuc, nam truc, nam thuoc
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
nam tu » nam thu, nam thuc

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