Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hoai nam » hai nam, loai nam, hoang nam
va trien » va truyen, va thiet, va tuyen
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
hoa nam » hoat nam, hoa am, ha nam
sach ty » sach y, sach tu, sach thu
xa hanh » xa thanh, xa khanh, va hanh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. hieu ((hoa nam) OR (hoai nam)) tuc xa hanh va ((cua tre) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang xa hoi. hieu ((hoa nam) OR (hoai nam)) tuc xa hanh va ((cua tre) or (va trien))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu ((hoa nam) OR (hoai nam)) tuc xa hanh va ((cua tre) or (va trien))*.