Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
su triet » su viet, su tien, ve triet
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
su cac » tu cac, su cao, su can
ho hoi » hoc hoi, hoa hoi, o hoi
co hoi » co hoc, co loi
di su » doi su, ki su, da su

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