Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ky lang » ky dang, ky tang, tay lang
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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) or (ky nang)) xa hoi. hieu van cac luc va danh va ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky nang)) xa hoi. hieu van cac luc va danh va ((cua te) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) or (ky nang)) xa hoi. hieu van cac luc va danh va ((cua te) OR (cua tu))*".