Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
cham cuu » cap cuu, chat cua
van cham » van chat, van tham, va cham
hanh di » hanh vi, hanh de, hang di
cuu ban » cuu van, cua ban, cuu san
cua tre » cua te, cuu tre, cua triet
o lang » hoa lang, hoi lang
y lang » _ lang, tay lang, yen lang
di cua » dai cua, doi cua, de 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 (toc sach)) ((y lang) or (o lang)) xa hoi. hieu van cham cuu ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((y lang) OR (o lang)) xa hoi. hieu van cham cuu ban hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((y lang) or (o lang)) xa hoi. hieu van cham cuu ban hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((y lang) or (o lang)) xa hoi. hieu van cham cuu ban hanh di cua tre*.