Perhaps you should try some spelling variations:
dat duoc » dat nuoc, da duoc, luat duoc
so sach » so sanh, bo sach, co sach
hieu de » hieu ve, hieu he, hieu le
duoc va » nuoc va, duc va, duoc ma
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
de dat » de dao
vi cuu » vinh cuu
vi luu » vi lua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang x hoi. hieu de dat duoc va hanh ((vi cuu) or (vi luu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang x hoi. hieu de dat duoc va hanh ((vi cuu) OR (vi luu)) tre.
• Adding a wildcard symbol may retrieve word variants: so sach y nang x hoi. hieu de dat duoc va hanh ((vi cuu) or (vi luu)) tre*.