Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va cham » va chat, va tham
va hang » van hang, va nang, va lang
va chua » vua chua, ca chua, va chu
y nang » ky nang, ly nang, v nang
va cam » va cac, va cao, va cai
luc va » duc va, tuc va, loc va
va cua » via cua, ca cua, ma cua
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu ((va cam) or (va cham)) luc va hang ((va cua) OR (va chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang x hoi. hieu ((va cam) OR (va cham)) luc va hang ((va cua) OR (va chua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang x hoi. hieu ((va cam) or (va cham)) luc va hang ((va cua) OR (va chua)) tre*".