Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
han tai » hang tai, nhan tai, van tai
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va
tai va » thai va, mai va, tri va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky lang xa hoi. hieu van cham ((soc va) OR (doc va)) han tai va (thiet or thieu)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu van cham ((soc va) OR (doc va)) han tai va (thiet OR thieu).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang xa hoi. hieu van cham ((soc va) OR (doc va)) han tai va (thiet or thieu)".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu van cham ((soc va) OR (doc va)) han tai va (thiet or thieu)*.