Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham cuu » cap cuu, chat cua
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
du tren » dua tren, dau tren, duc tren
cuu va » cuu van, cuu ve
vi du » vi dum, va du, ve 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 ((nang ma) or (tang ma)) hoi. lieu va cham cuu va hanh vi du tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang ma) OR (tang ma)) hoi. lieu va cham cuu va hanh vi du tren.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang ma) or (tang ma)) hoi. lieu va cham cuu va hanh vi du tren*.