Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
su triet » su viet, su tien, ve triet
ky trang » ky trong, ky tang, ky nang
ke trang » ke toan
hieu va » lieu va, hieu qua
dan dat » dung dat, dong dat, dinh dat
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
hieu ve » hieu van
va dan » ca dan, va dao, va dau
dat su » sat su

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 trang) OR (ke trang)) xa hoi. ((hieu ve) or (hieu va)) chat thuc va dan dat su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky trang) OR (ke trang)) xa hoi. ((hieu ve) OR (hieu va)) chat thuc va dan dat su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky trang) OR (ke trang)) xa hoi. ((hieu ve) or (hieu va)) chat thuc va dan dat su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky trang) OR (ke trang)) xa hoi. ((hieu ve) or (hieu va)) chat thuc va dan dat su triet*.