Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, vu khach
xa hanh » xa thanh, xa khanh, va hanh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
su sach » so sach
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) ky lang ha noi. ((hieu ve) or (hieu van)) cac tuc xa hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky lang ha noi. ((hieu ve) OR (hieu van)) cac tuc xa hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky lang ha noi. ((hieu ve) or (hieu van)) cac tuc xa hanh vi cua tre*.