Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
nang ma » tang ma, sang ma, nang cao
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
ma hoi » mai hoi, xa hoi, ma hoa
tu sac » tu cac, tu san, tu bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) OR (tu sach)) ky nang ma hoi. hieu van pham duc van hanh di ((cua viet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky nang ma hoi. hieu van pham duc van hanh di ((cua viet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu sach)) ky nang ma hoi. hieu van pham duc van hanh di ((cua viet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu sach)) ky nang ma hoi. hieu van pham duc van hanh di ((cua viet) or (su triet))*.