Perhaps you should try some spelling variations:
dung doi » huong doi, dung tai, dung co
danh doi » danh di, thanh doi, danh hoa
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cac tuc » cac toc, cac tu, cac tac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac

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 (xa hoi)). hieu ve cac tuc xa ((danh doi) or (dung doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ma hoi) OR (xa hoi)). hieu ve cac tuc xa ((danh doi) OR (dung doi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((ma hoi) or (xa hoi)). hieu ve cac tuc xa ((danh doi) or (dung doi)) cua tre*.