Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thanh than » thanh thanh, thanh thang, thanh phan
hieu van » hieu va, thien van, hieu ve
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va

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 y nang xa hoi. ((hieu van) or (lieu va)) bac xuc va ((thanh than) OR (thanh toan)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu van) OR (lieu va)) bac xuc va ((thanh than) OR (thanh toan)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu van) or (lieu va)) bac xuc va ((thanh than) OR (thanh toan)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu van) or (lieu va)) bac xuc va ((thanh than) OR (thanh toan)) cua tre*.