Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thai cua » than cua, tai cuc, tri cua
hieu van » hieu va, thien van, lieu va
van than » van thanh, van thang, van tuan
vai cua » dai cua, hai cua, lai cua
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
sach 2 » sach y
luc va » duc va, loc va
2 nang » v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach 2 nang xa hoi. hieu van than ((luc va) OR (tuc va)) hanh ((vai cua) or (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach 2 nang xa hoi. hieu van than ((luc va) OR (tuc va)) hanh ((vai cua) OR (thai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach 2 nang xa hoi. hieu van than ((luc va) OR (tuc va)) hanh ((vai cua) or (thai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach 2 nang xa hoi. hieu van than ((luc va) OR (tuc va)) hanh ((vai cua) or (thai cua)) tre*.