Perhaps you should try some spelling variations:
thien van » thi van
luat duoc » luat tuc
va triet » va thiet, va trien, ve triet
lam duoc » nam duoc, lam thuoc, tao duoc
dinh vu » dich vu, dinh ve, dinh cu
va dinh » van dinh, va kinh, va tinh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nano » truc nano
x hoi » o hoi, x ho, 5 hoi
vu va » vu van, tu va, su va

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 tu nano ((x hoi) OR (xa hoi)). thien van ((lam duoc) OR (luat duoc)) va dinh vu va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nano ((x hoi) or (xa hoi)). thien van ((lam duoc) OR (luat duoc)) va dinh vu va triet~".
• Adding a wildcard symbol may retrieve word variants: te sach tu nano ((x hoi) or (xa hoi)). thien van ((lam duoc) OR (luat duoc)) va dinh vu va triet*.