Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
danh lai » danh sai, gianh lai, dinh lam
chau tre » chay tren, chau tho, cho tre
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va
va danh » va dinh, va dan, va hanh
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) OR (ky nang)) xa hoi. ((hieu ve) or (hieu van)) coc luc va danh lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ty nang) OR (ky nang)) xa hoi. ((hieu ve) OR (hieu van)) coc luc va danh lai chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((ty nang) OR (ky nang)) xa hoi. ((hieu ve) or (hieu van)) coc luc va danh lai chau tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ty nang) OR (ky nang)) xa hoi. ((hieu ve) or (hieu van)) coc luc va danh lai chau tre*.