Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nang xa » lang xa, nang ma, mang xa
kinh va » kinh van, tinh va, sinh va
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
tu sac » tu sach, tu cac, tu san
thu va » thue va, tu va, thu ha
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang x)) hoi. hieu ve cam ((thu va) OR (thuc va)) kinh va su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (nang x)) hoi. hieu ve cam ((thu va) OR (thuc va)) kinh va su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (nang x)) hoi. hieu ve cam ((thu va) OR (thuc va)) kinh va su triet*.