Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
thuc xay » thuc day, tuc xay, thuat xay
su sach » so sach, vu sach
thuc xa » tuc xa, thuc va, thuc ha
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, de cua
cua su » qua su

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

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