Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
su sach » so sach, vu sach
ky dang » ky danh
nam duc » nam duoc, pham duc, nam thuc
cua tre » cua te, cuu tre, cua triet
cua tu » cua tuc, cua su, cua cu

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