Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
nam duoc » nam thuoc, da duoc, dat duoc
thanh di » thanh de, thanh do, thanh dinh
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma

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

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