Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
tu nano » truc nano
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va thanh, va danh
nano x » nano 1, nano o
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) tu nano x hoi. hieu va cac xuc ((va hanh) or (ban hanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) tu nano x hoi. hieu va cac xuc ((va hanh) OR (ban hanh)) vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) tu nano x hoi. hieu va cac xuc ((va hanh) or (ban hanh)) vi cua triet*".