Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh va » thanh van, hanh va, thanh ha
truc dan » thuc dan, tuc dan, truc dai
truc ban » thuc ban, truc van, truoc bang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
va cua » va chua, via cua, ca cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van 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 v nang xa hoi. ((hieu ve) or (hieu va)) cau ((truc ban) OR (truc dan)) thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach v nang xa hoi. ((hieu ve) OR (hieu va)) cau ((truc ban) OR (truc dan)) thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang xa hoi. ((hieu ve) or (hieu va)) cau ((truc ban) OR (truc dan)) thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: thuoc sach v nang xa hoi. ((hieu ve) or (hieu va)) cau ((truc ban) OR (truc dan)) thanh va cua te*.