Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
sach v » sach va, sach y, sach 2
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
v nang » va nang, vu nang, van nang
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach v nang xa hoi. ((hieu ve) or (hieu van)) coc ((luc va) OR (tuc va)) thanh va cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang xa hoi. ((hieu ve) OR (hieu van)) coc ((luc va) OR (tuc va)) thanh va cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang xa hoi. ((hieu ve) or (hieu van)) coc ((luc va) OR (tuc va)) thanh va cau theo".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. ((hieu ve) or (hieu van)) coc ((luc va) OR (tuc va)) thanh va cau theo*.