Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan
nang xa » nang x, lang xa, nang ma
danh vi » hanh vi, dinh vi, danh di
te sach » toc sach
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
vi su » va su, ve su, ki su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang xa hoi. ((hieu ve) OR (lieu va)) tham ((thuc va) OR (thuc day)) danh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang xa hoi. ((hieu ve) or (lieu va)) tham ((thuc va) OR (thuc day)) danh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: te sach v nang xa hoi. ((hieu ve) or (lieu va)) tham ((thuc va) OR (thuc day)) danh vi su triet*.