Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh dai » hanh tai, hanh dao, vanh dai
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ve chat » va chat, van chat
te sach » toc sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
va cao » va cac, va dao, va bao
dai va » mai va
va co » vo co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang xay hoi. hieu ((((va cao) or (va co))) or (ve chat)) thuc va hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xay hoi. hieu ((((va cao) OR (va co))) OR (ve chat)) thuc va hanh dai va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xay hoi. hieu ((((va cao) or (va co))) or (ve chat)) thuc va hanh dai va triet*.