Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
tu sach » thu sach, su sach, te sach
va phan » van phan, va phap, hoa phan
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu su, dieu vu
nang ho » nang hoc, nang co, tang ho
su tien » su kien, su hien, tu tieng
ho hoi » hoc hoi, hoa hoi, hoi hoi
lap su » lap du, lap tu, lai su

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 ky nang ho hoi. ((hieu vu) OR (hieu ve)) cham truc ((va phan) OR (va phat)) lap su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ho hoi. ((hieu vu) OR (hieu ve)) cham truc ((va phan) or (va phat)) lap su tien~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ho hoi. ((hieu vu) OR (hieu ve)) cham truc ((va phan) or (va phat)) lap su tien*.