Perhaps you should try some spelling variations:
ve triet » va trien, su triet
sach thu » sach thue, sach thieu, sach tham
dich su » lich su, dich vu, dich tu
van cam » van nam, van lam, van cau
sach ty » sach y, sach tu, xach tay
thi van » thi lan, thi hanh, thi nang
nano x » nano 1, nano o
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, x ho
su ve » su va

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 thu) or (sach ty)) nano x hoi. thi van cam ((xuc va) or (luc va)) dich su ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach ty)) nano x hoi. thi van cam ((xuc va) OR (luc va)) dich su ve triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach ty)) nano x hoi. thi van cam ((xuc va) or (luc va)) dich su ve triet*.