Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va hang » van hang, va nang, va lang
via cua » gia cua, gian cua, giau cua
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
va cua » va chua, ca cua, ma cua

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