Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
nang ma » tang ma, sang ma, mang may
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
vi dua » vi du, vi dum, vi lua

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 y ((nang ma) OR (nang cao)) hoi. lieu va cam luc va hanh vi dua tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang ma) OR (nang cao)) hoi. lieu va cam luc va hanh vi dua tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang ma) OR (nang cao)) hoi. lieu va cam luc va hanh vi dua tren*.