Perhaps you should try some spelling variations:
dan loai » dang loai, phan loai, nhan loai
tu sach » thu sach, su sach, te sach
loai su » loai sau, lai su, loai tu
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
su tien » su kien, su hien, tu tieng
hieu ve » hieu van
ky lang » ky dang, ky tang, tay lang
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau

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

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