Perhaps you should try some spelling variations:
van nhan » van phan, van thanh, danh nhan
nhan luc » nang luc
thai cua » than cua, tai cuc, tri cua
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
hai cua » dai cua, hoi cua, lai cua
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach 2, sach vay
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: su ((sach v) OR (sach y)) nang xa hoi. hieu van nhan luc va thanh ((hai cua) or (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach y)) nang xa hoi. hieu van nhan luc va thanh ((hai cua) OR (thai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) OR (sach y)) nang xa hoi. hieu van nhan luc va thanh ((hai cua) or (thai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) OR (sach y)) nang xa hoi. hieu van nhan luc va thanh ((hai cua) or (thai cua)) tre*.