Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh hoa » thanh pho
nam thuc » nam thuoc, am thuc, nam thu
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dai hai » dai han, dai tai, dai thao
dai hoi » dai hoc, dai moi
va nam » van nam, ha nam, va nay

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 ky nang ((dai hoi) OR (dai hai)). lieu va nam thuc va ((hanh vi) or (thanh hoa)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((dai hoi) OR (dai hai)). lieu va nam thuc va ((hanh vi) OR (thanh hoa)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((dai hoi) OR (dai hai)). lieu va nam thuc va ((hanh vi) or (thanh hoa)) cua triet*".