Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
dang xay » dang van, van xay
lang xa » lang ha, lang van
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
su viet » so viet
xuc va » duc va, tuc va, luc va
vi su » va su, ve su, ki su

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 (thuoc sach)) ty ((lang xa) or (dang xay)) hoi. hieu va cac xuc va danh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ty ((lang xa) OR (dang xay)) hoi. hieu va cac xuc va danh vi su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ty ((lang xa) or (dang xay)) hoi. hieu va cac xuc va danh vi su viet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ty ((lang xa) or (dang xay)) hoi. hieu va cac xuc va danh vi su viet*.