Perhaps you should try some spelling variations:
lanh hai » manh hai, thanh hai, lang chai
danh hai » dang hai, manh hai, danh hau
sach ky » sach y, sach ty, sach kem
hieu he » hieu ve, hiem he, hieu le
sang ma » tang ma, nang ma, sang tao
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
sac ky » cac ky, sai ky

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 ky) or (sac ky)) sang ma hoi. hieu he nam thu xa ((danh hai) OR (lanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) sang ma hoi. hieu he nam thu xa ((danh hai) OR (lanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) sang ma hoi. hieu he nam thu xa ((danh hai) OR (lanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) sang ma hoi. hieu he nam thu xa ((danh hai) OR (lanh hai)) cua tre*.