Perhaps you should try some spelling variations:
tang dai » tang tai, tang dan, lang dai
cac thuc » cach thuc, cac thu, can thuc
vat hanh » vat thanh, van hanh, nhat hanh
ve triet » va trien, su triet
su sach » so sach, vu sach
dai hoi » dai hoc, dai hai, dai moi
va hanh » van hanh, va thanh, va danh
y tang » ky tang, 6 tang, 7 tang
dai ve » dap ve, dau ve, dai va

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: su sach y tang dai hoi. lieu va cac thuc ((vat hanh) OR (va hanh)) dai ve triet~.
• Adding a wildcard symbol may retrieve word variants: su sach y tang dai hoi. lieu va cac thuc ((vat hanh) or (va hanh)) dai ve triet*.