Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
ve triet » va trien, su triet
nang hoc » nang doc, nang luc, dong hoc
vu cham » va cham, vu kham, tu cham
va phan » van phan, va phap, hoa phan
tu sach » thu sach, su sach, te sach
nang ho » nang co, tang ho, nang cao
hieu vu » hieu va, hieu ve, hieu su
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 y ((nang ho) OR (nang hoc)) hoi. hieu vu cham truc ((va phan) OR (va phat)) lap ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang ho) OR (nang hoc)) hoi. hieu vu cham truc ((va phan) or (va phat)) lap ve triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang ho) OR (nang hoc)) hoi. hieu vu cham truc ((va phan) or (va phat)) lap ve triet*.