Perhaps you should try some spelling variations:
soc duoc » hoc duoc, duoc duoc, hoa duoc
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
duoc xa » duoc ma, duoc va, duoc ha
xa tinh » va tinh, ha tinh, ca tinh
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
ve soc » ve so, ve suc
va cua » va chua, via cua, ca 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) OR (sach y)) nang xa hoi. hieu ve soc duoc xa tinh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) nang xa hoi. hieu ve soc duoc xa tinh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) nang xa hoi. hieu ve soc duoc xa tinh va cua tre*.