Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
dau luan » dan luan, dat luan, khau luan
thu sai » thu hai, thu tai, thu san
nang xa » nang x, lang xa, nang ma
luan va » luan van, luat va
va danh » va dinh, va dan, va hanh
sai ky » sac ky
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sai ky nang xa hoi. ((hieu van) or (lieu va)) dau luan va danh ((vi cua) OR (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky nang xa hoi. ((hieu van) OR (lieu va)) dau luan va danh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sai ky nang xa hoi. ((hieu van) or (lieu va)) dau luan va danh ((vi cua) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sai ky nang xa hoi. ((hieu van) or (lieu va)) dau luan va danh ((vi cua) OR (di cua)) tre*.