Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thi » sach thu, sach tai, sach tham
hanh tai » thanh tai, hang tai, han tai
cua hoi » cua moi
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
ca hoi » cau hoi, xa hoi, co hoi
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

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) or (sach thieu)) nang ((ca hoi) OR (cua hoi)). hieu va cam tuc va hanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach thieu)) nang ((ca hoi) OR (cua hoi)). hieu va cam tuc va hanh tai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) or (sach thieu)) nang ((ca hoi) OR (cua hoi)). hieu va cam tuc va hanh tai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) or (sach thieu)) nang ((ca hoi) OR (cua hoi)). hieu va cam tuc va hanh tai cua triet*.