Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc day
dan hai » doan hai, dang hai, dan khai
hai cua » thai cua, dai cua, hoi cua
x hoi » xa hoi, o hoi, 5 hoi
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((x hoi) or (x ho)). hieu ve am ((thuc va) OR (thuc dan)) dan hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (x ho)). hieu ve am ((thuc va) OR (thuc dan)) dan hai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) or (x ho)). hieu ve am ((thuc va) OR (thuc dan)) dan hai cua triet*".