Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
va triet » va thiet, va trien, ve triet
vien cac » vien bach, vien dai, vien da
thanh vi » hanh vi, thanh va, thanh ve
viec cac » viec cua, viec lam, viec va
tac van » tac vang, cac van, tac va
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
vi va » vi van, vai va, vu 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: su ((sach ky) OR (sach y)) lang xa hoi. hieu ((viec cac) OR (vien cac)) tac van thanh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) lang xa hoi. hieu ((viec cac) OR (vien cac)) tac van thanh vi va triet~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) lang xa hoi. hieu ((viec cac) OR (vien cac)) tac van thanh vi va triet*.