Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
su triet » su viet, su tien, ve triet
ky dang » ky nang, ky danh
thuc va » thuc vat, thuc dan, thuc day
ky lang » ky nang, ky tang, tay lang
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
tai su » tai so, tai tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ky lang) or (ky dang)) xa hoi. lieu va cam ((luc va) or (thuc va)) thanh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky lang) OR (ky dang)) xa hoi. lieu va cam ((luc va) OR (thuc va)) thanh tai su triet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky lang) or (ky dang)) xa hoi. lieu va cam ((luc va) or (thuc va)) thanh tai su triet*.