Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van pham » san pham, van phan, van tham
van phat » va phat, van chat, van phan
tan hanh » tan thanh, tang hanh, toan hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

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 ma) or (tang ma)) hoi. hieu ((van pham) or (van phat)) duc tan hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (tang ma)) hoi. hieu ((van pham) OR (van phat)) duc tan hanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (tang ma)) hoi. hieu ((van pham) or (van phat)) duc tan hanh di cua triet*.