Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
nhan luc » nang luc
va tinh » may tinh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu

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 ky ((lang van) or (dang van)) hoc. hieu van nhan luc ((va tinh) or (ban thanh)) va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((lang van) OR (dang van)) hoc. hieu van nhan luc ((va tinh) OR (ban thanh)) va cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((lang van) or (dang van)) hoc. hieu van nhan luc ((va tinh) or (ban thanh)) va cuu tre*.