Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
sach tay » xach tay, sach hay, sach nay
va trien » va truyen, va thiet, va tuyen
lang xa » lang ha, lang van
va tinh » may tinh
tinh ve » trinh ve, tinh ven, dinh ve
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tay ((lang xa) OR (dang xay)) hoi. hieu ve cam xuc va tinh ve ((cua te) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tay ((lang xa) OR (dang xay)) hoi. hieu ve cam xuc va tinh ve ((cua te) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tay ((lang xa) OR (dang xay)) hoi. hieu ve cam xuc va tinh ve ((cua te) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: toc sach tay ((lang xa) OR (dang xay)) hoi. hieu ve cam xuc va tinh ve ((cua te) or (va trien))*.