Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
dua tren » dung tren
doc sach » hoc sach, nuoc sach, dac sac
danh lai » danh sai, gianh lai, dinh lam
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
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) OR (doc sach)) ky sang xa hoi. hieu ve cam xuc va danh lai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ky sang xa hoi. hieu ve cam xuc va danh lai ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ky sang xa hoi. hieu ve cam xuc va danh lai ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) ky sang xa hoi. hieu ve cam xuc va danh lai ((dua tren) or (cua te))*.