Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cac thuc » cach thuc, cac thu, can thuc
hanh lai » hanh lam, hanh tai, thanh lap
sach thi » sach thu, sach tai, sach thieu
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
van ha » van hoa, van chat, van hanh
lan ha » lang ha, tan ha, ban ha

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 thi ((lan ha) OR (van ha)) hoi. hieu ve cac thuc va hanh lai ((cua triet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi ((lan ha) OR (van ha)) hoi. hieu ve cac thuc va hanh lai ((cua triet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi ((lan ha) OR (van ha)) hoi. hieu ve cac thuc va hanh lai ((cua triet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: tu sach thi ((lan ha) OR (van ha)) hoi. hieu ve cac thuc va hanh lai ((cua triet) or (cua vat))*.