Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
y nang » ly nang, v nang, may nang
va cua » va chua, via cua, ca cua
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: tu sach ((y nang) OR (ky nang)) xa hoi. hieu ((van cac) or (van hac)) nuoc va tinh va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) xa hoi. hieu ((van cac) OR (van hac)) nuoc va tinh va cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ky nang)) xa hoi. hieu ((van cac) or (van hac)) nuoc va tinh va cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ky nang)) xa hoi. hieu ((van cac) or (van hac)) nuoc va tinh va cua tu*.