Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
ky tang » ky dang, kho tang, ky trong
van cam » van nam, van lam, van cau
cam cuu » cham cuu, cap cuu
cuu ban » cuu van, cua ban, cuu san
hanh di » hanh de, hang di, danh di
cua tre » cua te, cuu tre, cua triet

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 tang) or (ky nang)) xa hoi. hieu van cam cuu ban ((hanh di) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky nang)) xa hoi. hieu van cam cuu ban ((hanh di) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky tang) or (ky nang)) xa hoi. hieu van cam cuu ban ((hanh di) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky tang) or (ky nang)) xa hoi. hieu van cam cuu ban ((hanh di) OR (hanh vi)) cua tre*.