Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
hoi dang » hoi dan, hoi lang, hai dang
cam thuc » am thuc, nam thuc, cam thu
hoi dong » hop dong, hoat dong, ha dong
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
vu sach » su sach, vu khach
vi ve » va ve, gi ve, ve ve

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

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