Perhaps you should try some spelling variations:
ban hanh » ban hang
va thanh » gia thanh, ban thanh, va tinh
cac duc » cac du, cao duc, cac dac
te sach » toc sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac
sach 2 » sach y
2 nang » v nang
di cau » diem cau
da cau » dat cau, va cau

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 2 nang xa hoi. hieu ve cac duc ((ban hanh) or (va thanh)) ((di cau) OR (da cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 nang xa hoi. hieu ve cac duc ((ban hanh) OR (va thanh)) ((di cau) OR (da cau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 nang xa hoi. hieu ve cac duc ((ban hanh) or (va thanh)) ((di cau) OR (da cau)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach 2 nang xa hoi. hieu ve cac duc ((ban hanh) or (va thanh)) ((di cau) OR (da cau)) tre*.