Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cham tuc » pham thuc, tham thuc, cham soc
doanh vi » doanh va, doan vi, doanh vien
va doanh » van doanh, vay doanh, va danh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
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 ((xa hoi) or (ma hoa)). hieu ve ((cham tuc) OR (nham thuc)) va doanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ((xa hoi) OR (ma hoa)). hieu ve ((cham tuc) OR (nham thuc)) va doanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ((xa hoi) or (ma hoa)). hieu ve ((cham tuc) OR (nham thuc)) va doanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ((xa hoi) or (ma hoa)). hieu ve ((cham tuc) OR (nham thuc)) va doanh vi cua tre*.