Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
duc manh » suc manh, duc anh, duc minh
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
hanh di » hang di, danh di, xanh di
hanh de » hanh ve, hanh kem
tu ban » thu ban, te ban
ban ky » van ky, dan 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 ban ky nang xa hoi. hieu van pham duc manh ((((hanh di) OR (hanh vi))) or (hanh de)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky nang xa hoi. hieu van pham duc manh ((((hanh di) OR (hanh vi))) OR (hanh de)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ban ky nang xa hoi. hieu van pham duc manh ((((hanh di) OR (hanh vi))) or (hanh de)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ban ky nang xa hoi. hieu van pham duc manh ((((hanh di) OR (hanh vi))) or (hanh de)) cua viet*.