Perhaps you should try some spelling variations:
nuoc duc » ngoc duc, nuoc cuc, duoc duoc
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve nuoc » ve duoc
va tinh » may tinh
tinh de » tinh da, sinh de, tinh he
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky nang xa hoi. hieu ve nuoc duc va tinh de ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang xa hoi. hieu ve nuoc duc va tinh de ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang xa hoi. hieu ve nuoc duc va tinh de ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang xa hoi. hieu ve nuoc duc va tinh de ((cua tre) OR (cua te))*.