Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
nang tai » hang tai, tang tai, sang tai
te sach » toc sach
hanh va » hang va, hanh vi
xuc van » duc van, luc van, xuc ban
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
tai hoi » tai khoi, dai hoi, tai hai
so sach » so sanh, bo sach, co sach
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (so sach)) ky nang tai hoi. ((hieu ve) or (hieu va)) cam xuc van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sach)) ky nang tai hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sach)) ky nang tai hoi. ((hieu ve) or (hieu va)) cam xuc van hanh va cua tre*.