Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van nhan » van phan, danh nhan, van khanh
nhan luc » nang luc
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach 2, sach vay
ma hoi » mai hoi, xa hoi, ma hoa

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

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