Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va chai » va cai, va chat, va cham
chai tu » cai tu, choi tu, chay tu
danh va » doanh va, hanh va, dan va
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
anh va » hanh va

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