Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan, thuc vat
toc sach » hoc sach, doc sach, thuoc sach
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc day
ky lang » ky nang, ky tang, tay lang
dan vai » dan va, dan tai, dan vat
vai cua » dai cua, hai cua, lai cua
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: toc sach ((ky lang) OR (ky dang)) xa hoi. hieu va nam ((thuc va) or (thuc dan)) dan vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky dang)) xa hoi. hieu va nam ((thuc va) OR (thuc dan)) dan vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) OR (ky dang)) xa hoi. hieu va nam ((thuc va) or (thuc dan)) dan vai cua triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) OR (ky dang)) xa hoi. hieu va nam ((thuc va) or (thuc dan)) dan vai cua triet*.