Perhaps you should try some spelling variations:
canh tinh » hanh tinh, canh tranh, nhanh tinh
manh tinh » man tinh, manh binh, hanh tinh
che duoc » che thuoc, te duoc, co duoc
tu sach » thu sach, su sach, te sach
sach re » sach de, sach tren, sach kem
re nghe » ve nghe, te nghe
nghe li » nghe vi, nghe di, nghe ki

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 re nghe li hoc ) or ( do ((canh tinh) OR (manh tinh)) ((che duoc) or (che do)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach re nghe li hoc ) OR ( do ((canh tinh) OR (manh tinh)) ((che duoc) OR (che do)) hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach re nghe li hoc ) or ( do ((canh tinh) OR (manh tinh)) ((che duoc) or (che do)) hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach re nghe li hoc ) or ( do ((canh tinh) OR (manh tinh)) ((che duoc) or (che do)) hoc ))*.