Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh vai » hanh vi, hanh va, hanh tai
ty nang » ky nang, ty xang, ty hang
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao
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: thuat sach ty nang ((x hoi) OR (o hoi)). hieu va cam ((duc va) or (tuc va)) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty nang ((x hoi) OR (o hoi)). hieu va cam ((duc va) OR (tuc va)) hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty nang ((x hoi) OR (o hoi)). hieu va cam ((duc va) or (tuc va)) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty nang ((x hoi) OR (o hoi)). hieu va cam ((duc va) or (tuc va)) hanh vai cua te*.