Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham cuu » cap cuu, chat cua
cu tren » dua tren
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
tu tren » tu truyen, tu tieng, tu trong
cuu va » cuu van, cuu ve

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 ((cu tren) OR (tu 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 ((cu tren) OR (tu tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang ma) or (tang ma)) hoi. lieu va cham cuu va hanh vi ((cu tren) OR (tu tren))*".