Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va dan, va hanh
ty nang » ky nang, ty xang, ty hang
lai cuu » lai cua, lai cuoc, loai cua
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty nang xa hoi. ((hieu ve) or (hieu van)) coc luc va danh ((lai cuu) OR (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty nang xa hoi. ((hieu ve) OR (hieu van)) coc luc va danh ((lai cuu) OR (lai chau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty nang xa hoi. ((hieu ve) or (hieu van)) coc luc va danh ((lai cuu) OR (lai chau)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty nang xa hoi. ((hieu ve) or (hieu van)) coc luc va danh ((lai cuu) OR (lai chau)) tre*.