Perhaps you should try some spelling variations:
danh doi » thanh doi, dung doi, danh hoa
su sach » so sach, vu sach
danh di » danh du, xanh di, danh dien
cac tac » cac toc, cac bac, cac dac
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
ma hoi » mai hoi, xa hoi, ma hoa
tac xa » tuc xa, tac da
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) or (ty hang)) ma hoi. hieu ve cac tac xa ((danh doi) OR (danh di)) 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 ve cac tac xa ((danh doi) OR (danh di)) 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 ve cac tac xa ((danh doi) OR (danh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) or (ty hang)) ma hoi. hieu ve cac tac xa ((danh doi) OR (danh di)) cua tre*.