Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu he » hieu ve, hiem he, hieu le
hiem xe » hiem xa
xa danh » va danh, dia danh, nam danh
sai cua » dai cua, hai cua, lai cua
hoi cua » hoi chuc
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 ky nang cau hoi. ((hieu he) or (hiem xe)) nam thu xa danh ((sai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cau hoi. ((hieu he) OR (hiem xe)) nam thu xa danh ((sai cua) OR (hoi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cau hoi. ((hieu he) or (hiem xe)) nam thu xa danh ((sai cua) or (hoi cua)) tre*.