Perhaps you should try some spelling variations:
giau cua » gian cua, gia cua, dieu cua
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach
via cua » gia cua, gian cua, rija cua
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
vu sach » vu bach, vu khach
bao bo » bac bo, ban bo, nao bo
y nang » ky nang, ly nang, v nang
va bao » va bai
bo va » bao va, do va, so 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) OR (vu sach)) y nang cao hoi. hieu va bao bo va thanh ((via cua) or (giau cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang cao hoi. hieu va bao bo va thanh ((via cua) OR (giau cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) y nang cao hoi. hieu va bao bo va thanh ((via cua) or (giau cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) y nang cao hoi. hieu va bao bo va thanh ((via cua) or (giau cua)) tre*.