Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
ty nang » ty xang, ty hang, ly nang
van cac » van hac, van cau, van bac
vai cua » dai cua, hai cua, lai cua
xuc va » tuc va, luc va, xac va
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty nang) OR (ky nang)) xa hoi. hieu van cac ((xuc va) or (duc va)) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ky nang)) xa hoi. hieu van cac ((xuc va) OR (duc va)) hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) OR (ky nang)) xa hoi. hieu van cac ((xuc va) or (duc va)) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) OR (ky nang)) xa hoi. hieu van cac ((xuc va) or (duc va)) hanh vai cua te*.