Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
gia cua » gian cua, giau cua, gia cuc
via cua » gian cua, giau cua, rija cua
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
so vat » so van
va bao » va bai
so va » so van, su va, do va

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 cao hoi. hieu va bao ((so va) or (so vat)) hanh ((via cua) or (gia cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cao hoi. hieu va bao ((so va) OR (so vat)) hanh ((via cua) OR (gia cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cao hoi. hieu va bao ((so va) or (so vat)) hanh ((via cua) or (gia cua)) tre*.