Perhaps you should try some spelling variations:
dang hai » dang khai, hang hai, dung hai
danh hai » lanh hai, manh hai, danh hau
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
thu xa » thu xac, thu ha, thu xe
ma hoi » mai hoi, xa hoi, me hoi
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ((ma hoi) OR (ma hoa)). hieu ve nam thu xa ((danh hai) or (dang hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ma hoi) OR (ma hoa)). hieu ve nam thu xa ((danh hai) OR (dang hai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((ma hoi) OR (ma hoa)). hieu ve nam thu xa ((danh hai) or (dang hai)) cua tre*".