Perhaps you should try some spelling variations:
chat hoc » chat hoa, chat thom, cho hoc
can cau » van cau, ban cau, ca cau
cac cau » cac mau, bac cau, ca cau
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((cao hoc) OR (chat hoc)). hieu ve cam tuc va dan ((cac cau) OR (can cau)) tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((cao hoc) OR (chat hoc)). hieu ve cam tuc va dan ((cac cau) OR (can cau)) tren".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((cao hoc) OR (chat hoc)). hieu ve cam tuc va dan ((cac cau) OR (can cau)) tren*.