Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hieu van » thien van, lieu va
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
suc van » su van, duc van, luc van
cao suc » cao su, cao duc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang o hai. ((((hieu ve) OR (hieu va))) OR (hieu van)) cao suc van hanh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang o hai. ((((hieu ve) OR (hieu va))) or (hieu van)) cao suc van hanh thai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang o hai. ((((hieu ve) OR (hieu va))) or (hieu van)) cao suc van hanh thai cua tre*.