Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
hanh dan » thanh dan, hanh san, canh dan
dam thuc » am thuc, dan thuc, nam thuc
toc sach » hoc sach, doc sach, thuoc sach
nang ro » nang co, nang ho, nang ra
van dam » van nam, van dao, van dau
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
nang o » nang co, nang ho, nang x
dan su » dang 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) or (toc sach)) ky ((nang o) or (nang ro)) hoc. hieu van dam thuc va hanh dan su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky ((nang o) OR (nang ro)) hoc. hieu van dam thuc va hanh dan su triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky ((nang o) or (nang ro)) hoc. hieu van dam thuc va hanh dan su triet*.