Perhaps you should try some spelling variations:
hieu hieu » hien hieu, hieu hien, thien hieu
hieu cac » hieu luc, hieu va, hieu van
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
lao va » tao va, cao va, bao va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho
lo va » lo van, ly va, le va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang x hoi. hieu hieu cac ((lo va) OR (lao va)) hanh vai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang x hoi. hieu hieu cac ((lo va) OR (lao va)) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x hoi. hieu hieu cac ((lo va) OR (lao va)) hanh vai cua te*.