Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
cach thuc » anh thuc, cac thu
hieu vien » hieu hien, hieu viec, thieu nien
vat hanh » vat thanh, van hanh, va hanh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
vai su » van su, lai su, tai su
x hoi » xa hoi, o hoi, x ho

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: tu sach ty nang x hoi. ((hieu vien) OR (bieu hien)) cach thuc vat hanh ((vai su) OR (va su)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. ((hieu vien) or (bieu hien)) cach thuc vat hanh ((vai su) OR (va su)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. ((hieu vien) or (bieu hien)) cach thuc vat hanh ((vai su) OR (va su)) triet*.