Perhaps you should try some spelling variations:
ve triet » va trien, su triet
vat hanh » vat thanh, van hanh, va hanh
dang hoa » dang hoai, dang khoa, dong hoa
hanh va » hang va, hanh vi
thu vat » thuc vat, thu va, thuat vat
hieu va » lieu va, hieu qua
su sach » vu sach
hoa doi » hoa dai, hoc doi, xoa doi
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
hieu ve » hieu van
va ve » va de, va le, va vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ky dang hoa doi. ((hieu ve) or (hieu va)) nam thu vat hanh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky dang hoa doi. ((hieu ve) OR (hieu va)) nam thu vat hanh va ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky dang hoa doi. ((hieu ve) or (hieu va)) nam thu vat hanh va ve triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky dang hoa doi. ((hieu ve) or (hieu va)) nam thu vat hanh va ve triet*.