Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
ban thanh » ban hanh, ban hang
thanh ca » thanh cha, thanh cac, thanh ha
truc ban » thuc ban, truc dan, truc van
hieu van » thien van, lieu va, hieu ve
hoc sach » hoc sinh, hoc cac, hoc anh
hieu va » lieu va, hieu qua
2 nang » v nang
ca cua » co cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) OR (hoc sach)) 2 nang x hoi. ((hieu van) or (hieu va)) cau truc ban thanh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) 2 nang x hoi. ((hieu van) OR (hieu va)) cau truc ban thanh ca cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (hoc sach)) 2 nang x hoi. ((hieu van) or (hieu va)) cau truc ban thanh ca cua te".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (hoc sach)) 2 nang x hoi. ((hieu van) or (hieu va)) cau truc ban thanh ca cua te*.