Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
tang ma » mang may, tang van
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cu tren » tu tren
cam luc » cam xuc, cau luc
va cam » va cham, va cac, va cao
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: thu sach ty ((nang cao) or (tang ma)) hoi. lieu va cam luc va danh vi ((cu tren) OR (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang cao) OR (tang ma)) hoi. lieu va cam luc va danh vi ((cu tren) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang cao) or (tang ma)) hoi. lieu va cam luc va danh vi ((cu tren) OR (dua tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang cao) or (tang ma)) hoi. lieu va cam luc va danh vi ((cu tren) OR (dua tren))*.