Perhaps you should try some spelling variations:
tham duc » pham duc, tham du, thach duc
than duc » tran duc, phan duc, than doc
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
de cuu » de 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 ky nang xa hoi. lieu va ((tham duc) OR (than duc)) ((van hanh) or (van minh)) de cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. lieu va ((tham duc) OR (than duc)) ((van hanh) OR (van minh)) de cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. lieu va ((tham duc) OR (than duc)) ((van hanh) or (van minh)) de cuu tre*".