Perhaps you should try some spelling variations:
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu va » lieu va, hieu qua
xuc van » luc van, xuc ban, thuc van
duc van » duc va, duc tan, duc manh
hanh di » hanh de, hang di, danh di
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
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: te sach tu nang x hoi. hieu va cam ((xuc van) OR (duc van)) ((hanh di) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang x hoi. hieu va cam ((xuc van) OR (duc van)) ((hanh di) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang x hoi. hieu va cam ((xuc van) OR (duc van)) ((hanh di) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang x hoi. hieu va cam ((xuc van) OR (duc van)) ((hanh di) or (hanh vi)) cua tre*.