Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
tang ma » mang may, tang van
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
luc va » duc va, tuc va, loc va
vi cu » vi su, vi xu, vi du

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 ((tang ma) or (nang cao)) hoi. lieu va cham luc va hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((tang ma) OR (nang cao)) hoi. lieu va cham luc va hanh vi cu tren.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((tang ma) or (nang cao)) hoi. lieu va cham luc va hanh vi cu tren*.