Perhaps you should try some spelling variations:
cua dang » cua cong, cua ban
hieu van » hieu va, thien van, lieu va
xa thanh » va thanh, ha thanh, ta thanh
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
vu dang » su dang, vu quang
ban tum » ban tu
cua tre » cua te, cuu tre, cua triet
tum xa » tuc xa, tu xa
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: ((su sach) or (do sanh)) ((vu dang) OR (cua dang)) xa hoi. hieu van ban tum xa thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (do sanh)) ((vu dang) OR (cua dang)) xa hoi. hieu van ban tum xa thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (do sanh)) ((vu dang) OR (cua dang)) xa hoi. hieu van ban tum xa thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (do sanh)) ((vu dang) OR (cua dang)) xa hoi. hieu van ban tum xa thanh vi cua tre*.