Perhaps you should try some spelling variations:
ban hanh » ban hang
te sach » toc sach
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
cau tra » ca tra, cau ra, cau truc
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
di cau » da cau, diem 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 v nang x ho. hieu ((van cac) OR (van hac)) duc ((ban hanh) or (gia thanh)) di cau tra~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang x ho. hieu ((van cac) OR (van hac)) duc ((ban hanh) OR (gia thanh)) di cau tra.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang x ho. hieu ((van cac) OR (van hac)) duc ((ban hanh) or (gia thanh)) di cau tra".
• Adding a wildcard symbol may retrieve word variants: te sach v nang x ho. hieu ((van cac) OR (van hac)) duc ((ban hanh) or (gia thanh)) di cau tra*.