Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hoi dang » hoi dan, hoi lang, hai dang
cam thuc » am thuc, nam thuc, cam thu
hoi dong » hop dong, hoat dong, ha dong
hieu van » hieu va, thien van, lieu va
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 » vu bach, vu khach
su sach » so sach
vi su » va su, ve su, ki su

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