Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
nam thuc » nam thuoc, am thuc, nam thu
thi sang » thi nang, thi hang, thi song
danh vai » danh sai, danh va, doanh van
sach thi » sach thu, sach tai, sach thieu
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thi sang ma hoi. ((hieu ve) or (hieu qua)) nam thuc va danh vai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi sang ma hoi. ((hieu ve) OR (hieu qua)) nam thuc va danh vai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thi sang ma hoi. ((hieu ve) or (hieu qua)) nam thuc va danh vai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach thi sang ma hoi. ((hieu ve) or (hieu qua)) nam thuc va danh vai ((cua triet) OR (va triet))*.