Perhaps you should try some spelling variations:
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
van cam » van lam, van cau, van dam
va dinh » van dinh, va kinh, va tinh
dinh tu » danh tu, dinh cu, tinh tu
nano x » nano 1, nano o
xuc va » duc va, tuc va, luc va
thiet » thieu

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