Perhaps you should try some spelling variations:
le triet » ve triet, le tien, le viet
thu sach » thuat sach, thuoc sach, thu hoach
hieu ve » hieu van
tinh tu » trinh tu, tinh thua, tinh yeu
va tinh » may tinh
hieu va » lieu va, hieu qua
tu sach » su sach, te sach, tu cach
tu nano » truc nano
nano x » nano 1, nano o
xuc va » duc va, tuc va, luc va
tu le » vu le, tu te

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tu nano x ho. ((hieu ve) OR (hieu va)) cam xuc va tinh tu le triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) tu nano x ho. ((hieu ve) or (hieu va)) cam xuc va tinh tu le triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) tu nano x ho. ((hieu ve) or (hieu va)) cam xuc va tinh tu le triet*.