Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham tuc » nham thuc, pham thuc, tham thuc
cua tre » cua te, cuu tre, dua tren
doan vi » doan va, don vi, doan thi
va doan » va doanh, van doan, va dan
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, ma hoa, me hoi
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 sang ((ma hoi) or (xa hoi)). hieu ve cham tuc va doan vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ((ma hoi) OR (xa hoi)). hieu ve cham tuc va doan vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ((ma hoi) or (xa hoi)). hieu ve cham tuc va doan vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ((ma hoi) or (xa hoi)). hieu ve cham tuc va doan vi ((cua tre) OR (cua triet))*.