Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
su triet » su viet, su tien
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
ve triet » va trien
hoi hoi » hoi hoc, hoc hoi, hoi doi
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
ho hoi » hoc hoi, hoa hoi, co hoi
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky nang ((ho hoi) or (hoi hoi)). hieu van tham thuc va hanh di ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky nang ((ho hoi) OR (hoi hoi)). hieu van tham thuc va hanh di ((su triet) OR (ve triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky nang ((ho hoi) or (hoi hoi)). hieu van tham thuc va hanh di ((su triet) OR (ve triet))*".