Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, va trien, ve triet
ky dang » ky nang, ky danh
thuc va » thuc vat, thuc dan, thuc day
ky lang » ky nang, ky tang, tay lang
toan va » doan va, tran van, toan ban
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky lang) OR (ky dang)) xa hoi. lieu va cam ((luc va) or (thuc va)) thanh toan va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky dang)) xa hoi. lieu va cam ((luc va) OR (thuc va)) thanh toan va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) OR (ky dang)) xa hoi. lieu va cam ((luc va) or (thuc va)) thanh toan va triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) OR (ky dang)) xa hoi. lieu va cam ((luc va) or (thuc va)) thanh toan va triet*.