Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
cham duc » pham duc, cham soc, pham duy
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
lang ha » long ha
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang ma) OR (lang ha)) hoi. lieu va cham duc van hanh lai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang ma) or (lang ha)) hoi. lieu va cham duc van hanh lai ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang ma) or (lang ha)) hoi. lieu va cham duc van hanh lai ((cua triet) OR (cua viet))*.