Perhaps you should try some spelling variations:
tinh viec » tinh viet, dinh viec, sinh viec
cua triet » cua viet, su triet, va triet
nam duoc » nam thuoc, da duoc, dat duoc
duoc may » duoc ma, duoc ly, hoc may
tang ma » tang van
hieu va » hieu qua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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 ((tang ma) OR (mang may)) hoi. ((hieu va) or (lieu va)) nam duoc may tinh viec cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((tang ma) OR (mang may)) hoi. ((hieu va) OR (lieu va)) nam duoc may tinh viec cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((tang ma) OR (mang may)) hoi. ((hieu va) or (lieu va)) nam duoc may tinh viec cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((tang ma) OR (mang may)) hoi. ((hieu va) or (lieu va)) nam duoc may tinh viec cua triet*.