Perhaps you should try some spelling variations:
he triet » ve triet, chet triet, hieu triet
te sach » toc sach
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
thuc va » thuc vat, thuc dan, thuc day
dinh ke » dinh ket, dinh ve, dinh le
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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 tang) OR (ky dang)) xa hoi. lieu va cam ((xuc va) or (thuc va)) dinh ke he triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky dang)) xa hoi. lieu va cam ((xuc va) OR (thuc va)) dinh ke he triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky tang) OR (ky dang)) xa hoi. lieu va cam ((xuc va) or (thuc va)) dinh ke he triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky tang) OR (ky dang)) xa hoi. lieu va cam ((xuc va) or (thuc va)) dinh ke he triet*.