Perhaps you should try some spelling variations:
tinh than » tinh thanh, tinh toan, tinh thai
hieu van » hieu va, thien van, hieu ve
than cua » nhan cua, thai cua, ban cua
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
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) OR (vu sach)) ky nang xa hoi. ((hieu van) or (lieu va)) bac xuc va tinh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang xa hoi. ((hieu van) OR (lieu va)) bac xuc va tinh than cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang xa hoi. ((hieu van) or (lieu va)) bac xuc va tinh than cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang xa hoi. ((hieu van) or (lieu va)) bac xuc va tinh than cua tre*.