Perhaps you should try some spelling variations:
luan phan » luan van, luan hoan
hieu luan » hieu luat, hieu quan, tieu luan
phan duc » pham duc, phan tu, phan dau
tu sach » thu sach, su sach, te sach
van anh » van thanh, tuan anh, van minh
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
vi su » ki su, oi su, vi xu

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 ty nang xa hoi. hieu luan phan duc van anh ((vi su) or (((ve su) OR (va su)))) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu luan phan duc van anh ((vi su) OR (((ve su) OR (va su)))) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu luan phan duc van anh ((vi su) or (((ve su) OR (va su)))) viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu luan phan duc van anh ((vi su) or (((ve su) OR (va su)))) viet*.