Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cam thuc » am thuc, nam thuc, cam thu
cong xay » thong xay, trong xay, cong ty
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
sach tai » sach bai, sach tham, sach dao
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
vu sach » vu bach, su sach, vu khach
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua

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 tai cong xay hoi. ((hieu ve) OR (hieu va)) cam thuc va hanh lai ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tai cong xay hoi. ((hieu ve) OR (hieu va)) cam thuc va hanh lai ((su triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tai cong xay hoi. ((hieu ve) OR (hieu va)) cam thuc va hanh lai ((su triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: vu sach tai cong xay hoi. ((hieu ve) OR (hieu va)) cam thuc va hanh lai ((su triet) or (cua viet))*.