Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
van cua » vang cua, ban cua, dan cua
hieu va » lieu va
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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 thien van cua mot. ((hieu va) OR (hieu qua)) cam luc va hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thien van cua mot. ((hieu va) OR (hieu qua)) cam luc va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: toc sach thien van cua mot. ((hieu va) OR (hieu qua)) cam luc va hanh vi cua viet*.