Perhaps you should try some spelling variations:
van pham » van phan, van phat, van tham
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
hanh de » hanh ve, hanh kem
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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