Perhaps you should try some spelling variations:
phan duc » phan tu, phan dau, tran duc
van hanh » van thanh, ban hanh, van anh
dua tren » dung tren
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua te » cua tu

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