Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
viec lam » viec va
viec cac » vien cac, viec cua, viec va
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vai va, bi va
vu va » vu van, tu va, 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 ty nang x hoi. hieu ((viec cac) or (viec lam)) nuoc va thanh ((vi va) OR (vu va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu ((viec cac) OR (viec lam)) nuoc va thanh ((vi va) OR (vu va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu ((viec cac) or (viec lam)) nuoc va thanh ((vi va) OR (vu va)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ((viec cac) or (viec lam)) nuoc va thanh ((vi va) OR (vu va)) triet*.