Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
tay tang » tay lang, tay trung, tay quang
su sach » so sach, vu sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
su viet » so viet
hieu ve » hieu van
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tay tang ((xa hoi) or (ma hoa)). ((hieu ve) or (hieu va)) cam luc va hanh va su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tay tang ((xa hoi) OR (ma hoa)). ((hieu ve) OR (hieu va)) cam luc va hanh va su viet.
• Adding a wildcard symbol may retrieve word variants: su sach tay tang ((xa hoi) or (ma hoa)). ((hieu ve) or (hieu va)) cam luc va hanh va su viet*.