Perhaps you should try some spelling variations:
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
che thuoc » nha thuoc, cay thuoc, cua thuoc
che duoc » che do, te duoc, co duoc
du nhanh » duy nhanh, du hanh, day nhanh
sach te » sach tet, sach de, sach tu
nghe vi » nghe va, nghe noi
vi hoc » li hoc, va hoc

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