Perhaps you should try some spelling variations:
tcanh tinh » thanh tinh, nhanh tinh, hanh tinh
canh tinh » hanh tinh, manh tinh, canh tranh
hieu cach » chieu sach, hieu ca, biet cach
chat bang » chat ban, chat quang, thuat bang
bang song » nang song
tac thanh » bac thanh, cac thanh, tcc thanh
thanh ban » thanh san, thanh van, thanh bac
hieu cac » hieu luc, hieu va, hieu van
song tac » cong tac, sang tac, dong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu cach) OR (hieu cac)) - ((canh tinh) or (tcanh tinh)) chat bang song tac thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (hieu cac)) - ((canh tinh) OR (tcanh tinh)) chat bang song tac thanh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cach) OR (hieu cac)) - ((canh tinh) or (tcanh tinh)) chat bang song tac thanh ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) OR (hieu cac)) - ((canh tinh) or (tcanh tinh)) chat bang song tac thanh ban*.