Perhaps you should try some spelling variations:
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
sach vu » sach va, sach tu, sach uu
cau tre » cau tren, cau treo, cuu tre
te sach » toc sach
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang
cau tra » ca tra, cau ra, cau truc

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 vu nang xa hoi. hieu van cac duc ((ban hanh) or (va thanh)) di ((cau tre) OR (cau tra))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang xa hoi. hieu van cac duc ((ban hanh) OR (va thanh)) di ((cau tre) OR (cau tra)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang xa hoi. hieu van cac duc ((ban hanh) or (va thanh)) di ((cau tre) OR (cau tra))".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang xa hoi. hieu van cac duc ((ban hanh) or (va thanh)) di ((cau tre) OR (cau tra))*.