Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
va danh » va dinh, va hanh, dia danh
hieu ly » hieu ky, lieu ly, dieu 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
ly dat » ly dai, ly dao, ly mat
va dan » ca dan, va dao, va dau
vi cuu » vi luu, vinh cuu
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 ly dat nuoc ((va danh) OR (va dan)) vi 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 ly dat nuoc ((va danh) OR (va dan)) vi 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 ly dat nuoc ((va danh) OR (va dan)) vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) or (ly nang)) ma hoi. hieu ly dat nuoc ((va danh) OR (va dan)) vi cuu tre*.