Perhaps you should try some spelling variations:
hanh mang » nhanh mang, hanh trang, nhanh lang
lam dung » lam dong, lan dung, am dung
nam duoc » nam thuoc, da duoc, dat duoc
ban hanh » ban hang
mang cua » manh cua, dung cua, ban cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi hanh, thi nang
cua tre » cua te, cuu tre, cua triet

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. ((thien van) OR (thi van)) ((lam dung) or (nam duoc)) ban hanh mang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((thien van) OR (thi van)) ((lam dung) OR (nam duoc)) ban hanh mang cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((thien van) OR (thi van)) ((lam dung) or (nam duoc)) ban hanh mang cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((thien van) OR (thi van)) ((lam dung) or (nam duoc)) ban hanh mang cua tre*.