Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
toc sach » hoc sach, doc sach, thuoc sach
van cau » van dau, van hau, van chat
hang di » hang doi, hang vi, hang dien
thi van » thi lan, thi hanh, thi nang
v nang » va nang, vu nang, van nang
xuc va » tuc va, luc va, xac va
x hoi » xa hoi, o hoi, x ho
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) v nang x hoi. thi van cau ((xuc va) or (duc va)) hang di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v nang x hoi. thi van cau ((xuc va) OR (duc va)) hang di su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) v nang x hoi. thi van cau ((xuc va) or (duc va)) hang di su triet*".