Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dieu » han dieu, hinh dieu, hoang dieu
dieu cua » dieu tra
thuc van » thuc vat, thuc dan, thuc va
hieu van » hieu va, thien van, lieu va
thu van » thuy van, tu van, chu van
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang o hai. ((hieu ve) or (hieu van)) cam ((thu van) OR (thuc van)) hanh dieu cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang o hai. ((hieu ve) OR (hieu van)) cam ((thu van) OR (thuc van)) hanh dieu cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang o hai. ((hieu ve) or (hieu van)) cam ((thu van) OR (thuc van)) hanh dieu cua triet*".