Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
vi cua » vai cua, di cua
cua te » cua tu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ty nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (va cam)) duc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x hoi) OR (o hoi)). hieu ((ve cam) OR (va cam)) duc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (va cam)) duc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) OR (o hoi)). hieu ((ve cam) or (va cam)) duc va hanh vi cua te*.