Perhaps you should try some spelling variations:
chua triet » cua triet, chua thiet, chua trieu
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, nam thu, nam tu
vat hanh » vat thanh, van hanh, va hanh
bo sach » co sach, hoc sach
te sach » toc sach
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((bo sach) or (te sach)) ky nang x hoi. hieu van ((nam thuc) OR (am thuc)) vat hanh va chua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (te sach)) ky nang x hoi. hieu van ((nam thuc) OR (am thuc)) vat hanh va chua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) or (te sach)) ky nang x hoi. hieu van ((nam thuc) OR (am thuc)) vat hanh va chua triet".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (te sach)) ky nang x hoi. hieu van ((nam thuc) OR (am thuc)) vat hanh va chua triet*.