Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan
sinh dai » sinh thai, si dai, sinh vat
su triet » su viet, su tien, ve triet
nang co » nang cao, nang doc, nang noi
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
dai su » dai sua, dai so, dan su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang co hoi. hieu van nam ((thuc day) or (thuc vat)) sinh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang co hoi. hieu van nam ((thuc day) OR (thuc vat)) sinh dai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang co hoi. hieu van nam ((thuc day) or (thuc vat)) sinh dai su triet*.