Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, le thanh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
nam duc » nam duoc, pham duc, nam thuc
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat toan)) ky nang xa hoi. hieu van nam duc ((va thanh) OR (va tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat toan)) ky nang xa hoi. hieu van nam duc ((va thanh) OR (va tinh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat toan)) ky nang xa hoi. hieu van nam duc ((va thanh) OR (va tinh)) vi cua tre*".