Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dua ban » dia ban, cua ban, qua ban
xuc ban » duc ban, cuc ban, quoc ban
van cam » van nam, van lam, van cau
te sach » toc sach
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
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: te sach ((ky lang) OR (ky dang)) ha hoi. hieu van cam ((xuc ban) or (dua ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky dang)) ha hoi. hieu van cam ((xuc ban) OR (dua ban)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky dang)) ha hoi. hieu van cam ((xuc ban) or (dua ban)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky dang)) ha hoi. hieu van cam ((xuc ban) or (dua ban)) hanh vi cua tre*.