Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
hieu le » hieu ve, hieu he, hieu ly
ly nang » ky nang, ly hang, ly vang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, v nang, may nang
le dat » le dan, de dat, le dac
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) or (ly nang)) ma hoi. hieu le dat nuoc va ((danh vi) OR (danh di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (ly nang)) ma hoi. hieu le dat nuoc va ((danh vi) OR (danh di)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y nang) or (ly nang)) ma hoi. hieu le dat nuoc va ((danh vi) OR (danh di)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) or (ly nang)) ma hoi. hieu le dat nuoc va ((danh vi) OR (danh di)) cuu tre*.