Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dau tren » dau tien, dat tren, dau tieng
danh tac » canh tac, danh bac, doanh tai
tac hai » tuc hai, tac ha, tai hai
ky danh » ky anh, ky dang
sach ky » sac ky, sach y, sach ty
va cam » va cham, va cao, va cai
luc va » duc va, tuc va
loc va » hoc va
vi dau » vi dai, va dau, bi dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky danh tac hai. lieu ((va cam) OR (va cac)) ((luc va) or (loc va)) hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky danh tac hai. lieu ((va cam) OR (va cac)) ((luc va) OR (loc va)) hanh vi dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky danh tac hai. lieu ((va cam) OR (va cac)) ((luc va) or (loc va)) hanh vi dau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky danh tac hai. lieu ((va cam) OR (va cac)) ((luc va) or (loc va)) hanh vi dau tren*.