Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cham truc » cau truc, pham thuc, nam truc
van phan » van phong, van thanh, luan phan
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu tu » chieu tu, hieu tuc, hien tu
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
ho hoi » hoc hoi, hoa hoi, hoi hoi
lap su » lap tu, lai su, lap so

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 ho hoi. hieu tu ((cham truc) OR (nham thuc)) van phan ((lap su) OR (lap du)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ho hoi. hieu tu ((cham truc) or (nham thuc)) van phan ((lap su) OR (lap du)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ho hoi. hieu tu ((cham truc) or (nham thuc)) van phan ((lap su) OR (lap du)) triet*.