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

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 le dat nuoc 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 le dat nuoc va hanh ((vi cuu) OR (vi luu)) tre.
• Adding a wildcard symbol may retrieve word variants: so sach y nang x hoi. hieu le dat nuoc va hanh ((vi cuu) or (vi luu)) tre*.