Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » thien van, lieu va, hieu ve
hieu va » lieu va, hieu qua
va danh » va dinh, va hanh, dia danh
thu sai » thu hai, thu tai, thu san
dau xua » dau cua, dao xuan, dau luan
nang xa » nang x, lang xa, nang ma
sai ky » sac ky
va dan » ca dan, va dao, va dau
vi cua » vai cua, di 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 (hieu va)) dau xua ((va danh) or (va dan)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky nang xa hoi. ((hieu van) OR (hieu va)) dau xua ((va danh) OR (va dan)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sai ky nang xa hoi. ((hieu van) OR (hieu va)) dau xua ((va danh) or (va dan)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sai ky nang xa hoi. ((hieu van) OR (hieu va)) dau xua ((va danh) or (va dan)) vi cua triet*.