Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
nganh xay » nganh mac, nganh y, nganh ma
cau triet » cau trieu, su triet, cua triet
cau treo » cau theo, cau tren, cau trieu
lang ha » long ha
cong ha » cong hoa, dong ha, cong tac
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nganh xay ((lang ha) or (cong ha)) hoi. hieu va cau truc va hanh vi ((cau treo) OR (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh xay ((lang ha) OR (cong ha)) hoi. hieu va cau truc va hanh vi ((cau treo) OR (cau triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh xay ((lang ha) or (cong ha)) hoi. hieu va cau truc va hanh vi ((cau treo) OR (cau triet))".
• Adding a wildcard symbol may retrieve word variants: hoc nganh xay ((lang ha) or (cong ha)) hoi. hieu va cau truc va hanh vi ((cau treo) OR (cau triet))*.