Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hac xuc » chat xuc
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
lai ve » loai ve, lai va, la ve
va hac » van hac, va khac, va cac

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 ((tu nang) OR (tu nong)) xa hoi. hieu va hac xuc ((va hanh) or (va danh)) lai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tu nong)) xa hoi. hieu va hac xuc ((va hanh) OR (va danh)) lai ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) OR (tu nong)) xa hoi. hieu va hac xuc ((va hanh) or (va danh)) lai ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) OR (tu nong)) xa hoi. hieu va hac xuc ((va hanh) or (va danh)) lai ve triet*.