Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
lai cua » dai cua, hai cua, lai chau
tu sach » thu sach, su sach, te sach
ve bac » ve bao, ve cac, ve ban
co hoa » co hoat, cho hoa, co hoc
bo van » vo van, so van, do van
o hoa » do hoa, so hoa, o 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 ky nang ((o hoa) or (co hoa)). hieu ((ve bac) or (vien cac)) bo van hanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoa) OR (co hoa)). hieu ((ve bac) OR (vien cac)) bo van hanh lai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoa) or (co hoa)). hieu ((ve bac) or (vien cac)) bo van hanh lai cua triet*.