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

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