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

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