Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
can cau » van cau, ban cau, cac cau
cam thu » nam thu, cac thu, ca thu
hieu ve » hieu va, hieu van
tu cach » tu cac
cao hoi » cau hoi, co hoi, cao hoc
thu va » thuc va, thue va, tu va
va dan » ca dan, va dao, va dau
ca cau » cua cau, cac cau, ca cac
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky nang cao hoi. hieu ve cam thu va dan ((ca cau) OR (can cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky nang cao hoi. hieu ve cam thu va dan ((ca cau) OR (can cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky nang cao hoi. hieu ve cam thu va dan ((ca cau) OR (can cau)) tren".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky nang cao hoi. hieu ve cam thu va dan ((ca cau) OR (can cau)) tren*.