Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
hoi dang » hoi dan, hoi lang, hai dang
va triet » va thiet, va trien, ve triet
hoi dong » hop dong, hoat dong, ha dong
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
xay hoi » xa hoi, tay hoi, cay phoi
va hieu » van hieu, va dieu, va hien

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

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