Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
va kinh » va tinh
lam xuc » cam xuc, lam duoc
tu sach » thu sach, su sach, tu cach
tu nano » truc nano
te sach » toc sach
hieu va » lieu va, hieu qua
nano 1 » nano o
va lam » van lam, va lap
1 ho » x ho, 1 ha, 1 h

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) or (te sach)) tu nano 1 ho. hieu va lam xuc ((va kinh) or (qua kinh)) tu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) tu nano 1 ho. hieu va lam xuc ((va kinh) OR (qua kinh)) tu va triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) tu nano 1 ho. hieu va lam xuc ((va kinh) or (qua kinh)) tu va triet*.