Perhaps you should try some spelling variations:
dung doi » huong doi, dung tai, dung co
su sach » vu sach
doi cua » dai cua, hoi cua
xa dung » xay dung, xa dong, va dung
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
hieu ve » hieu van
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam tuc xa dung doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam tuc xa dung doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam tuc xa dung doi cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam tuc xa dung doi cua te*.