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

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