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

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 v ((nang xa) or (nang cao)) hoi. ((hieu ve) 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 v ((nang xa) OR (nang cao)) hoi. ((hieu ve) OR (hieu va)) cau truc ban thanh ca cua te.
• Adding a wildcard symbol may retrieve word variants: thuoc sach v ((nang xa) or (nang cao)) hoi. ((hieu ve) or (hieu va)) cau truc ban thanh ca cua te*.