Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
dinh ve » dinh van
luu tre » luu tru, cuu tre, luy tre
y nang » ky nang, ly nang, v nang
cam lo » nam lo, cam ly, cam o
cam ky » cao ky, cac 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 sach y nang xa hoi. hieu ve ((cam lo) or (cam ky)) va ((dinh ve) or (dinh ket)) luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ve ((cam lo) OR (cam ky)) va ((dinh ve) OR (dinh ket)) luu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ve ((cam lo) or (cam ky)) va ((dinh ve) or (dinh ket)) luu tre*.