Perhaps you should try some spelling variations:
cham cuu » cap cuu, chat cua
va thanh » gia thanh, ban thanh, va tinh
cac tren » ca tren, cau tren, rac tren
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
va hanh » van hanh, va danh, ban hanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang xa) or (nang cao)) hoi. lieu va cham cuu ((va hanh) OR (va thanh)) va cac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang cao)) hoi. lieu va cham cuu ((va hanh) OR (va thanh)) va cac tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (nang cao)) hoi. lieu va cham cuu ((va hanh) OR (va thanh)) va cac tren*".