Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
su sach » so sach, vu sach
xa danh » va danh, dia danh, nam danh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
ve cac » va cac, vien cac
cua tu » cua tuc, cua su, cua cu

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 nang ((mai hoi) OR (dai hoi)). hieu ve cac tuc xa danh doi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((mai hoi) OR (dai hoi)). hieu ve cac tuc xa danh doi ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((mai hoi) OR (dai hoi)). hieu ve cac tuc xa danh doi ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((mai hoi) OR (dai hoi)). hieu ve cac tuc xa danh doi ((cua te) or (cua tu))*.