Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban hanh » ban hang
tham duc » pham duc, tham du, than duc
va tham » van tham, va cham, va thanh
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, duc van, dua ban
o hoc » co hoc, mo hoc, so hoc
di su » doi su, da su, de su
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang ((o hoc) or (xa hoi)). lieu va tham duc ban hanh ((di su) OR (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((o hoc) OR (xa hoi)). lieu va tham duc ban hanh ((di su) OR (ki su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ((o hoc) or (xa hoi)). lieu va tham duc ban hanh ((di su) OR (ki su)) triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((o hoc) or (xa hoi)). lieu va tham duc ban hanh ((di su) OR (ki su)) triet*.