Perhaps you should try some spelling variations:
va thanh » ban thanh, va tinh, le thanh
than cua » nhan cua, thai cua, ban cua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va danh, ban hanh
hai cua » thai cua, dai cua, hoi cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach v nang xa hoi. hieu ((va thanh) OR (gia thanh)) duc va hanh ((hai cua) or (than cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang xa hoi. hieu ((va thanh) OR (gia thanh)) duc va hanh ((hai cua) OR (than cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang xa hoi. hieu ((va thanh) OR (gia thanh)) duc va hanh ((hai cua) or (than cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. hieu ((va thanh) OR (gia thanh)) duc va hanh ((hai cua) or (than cua)) tre*.