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
hieu he » hieu ve, hiem he, hieu le
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
he nam » ha nam, nghe nam
thu xa » thu xac, thu ha, thu xe

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) OR (ty hang)) ma hoi. hieu he 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) OR (ty hang)) ma hoi. hieu he 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) OR (ty hang)) ma hoi. hieu he nam thu xa ((danh hai) or (dang hai)) cua tre*".