Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
trinh vi » trinh va, trinh ve, trinh viet
viec cac » vien cac, viec cua, viec va
viec lam » viec va
sach ty » sach y, sach tu, sach thu
tinh vi » tinh voi, tinh va, dinh vi
tu sach » thu sach, su sach, te sach
xang x » nang x
x hoi » xa hoi, o hoi, x ho

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 ty xang x hoi. hieu ((viec cac) or (viec lam)) nuoc va ((tinh vi) OR (trinh vi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang x hoi. hieu ((viec cac) OR (viec lam)) nuoc va ((tinh vi) OR (trinh vi)) va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang x hoi. hieu ((viec cac) or (viec lam)) nuoc va ((tinh vi) OR (trinh vi)) va triet*".