Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
nang hoi » nang noi, nang hoc, nang ho
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hoi hoi » hoi hoc, hoc hoi, hoi doi
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va phan » van phan, va phap, hoa phan
lap ve » dap ve, lap va, tap ve

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 hoi hoi. hieu vu cham truc ((va phan) OR (va phat)) lap ve triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang hoi hoi. hieu vu cham truc ((va phan) or (va phat)) lap ve triet*.