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

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