Perhaps you should try some spelling variations:
bac viet » hoc viet, mai viet, dao viet
dinh tai » dinh toai, dinh tri, dinh thi
ve cham » va cham, ve chat, vu cham
tai bac » tao bac, tai cac, tai ban
va dinh » van dinh, va kinh, va tinh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
tu san » thu san, tu ban, vu san
tu can » tu ban, tu cac, thu canh
ve cam » ve cac, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) OR (tu can)) ky lang xa hoi. hieu ((ve cam) or (ve cham)) duc va dinh tai bac viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu can)) ky lang xa hoi. hieu ((ve cam) OR (ve cham)) duc va dinh tai bac viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) OR (tu can)) ky lang xa hoi. hieu ((ve cam) or (ve cham)) duc va dinh tai bac viet".
• Adding a wildcard symbol may retrieve word variants: ((tu san) OR (tu can)) ky lang xa hoi. hieu ((ve cam) or (ve cham)) duc va dinh tai bac viet*.