Perhaps you should try some spelling variations:
sach tao » sach dao, sach bao, sach tai
tao nang » cao nang, tao bang, tai nang
nang cau » nang cao, hang cau, nang dau
dua tren » dung tren
ban hanh » ban hang
hanh va » hang va, hanh vi
xuc ban » duc ban, cuc ban, quoc ban
vu sach » vu bach, su sach, vu khach
va cham » va chat, va tham
cuu tre » cua tre, cau tren, cau treo
va cam » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach tao nang cau hoi. lieu ((va cam) OR (va cham)) xuc ban hanh va ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tao nang cau hoi. lieu ((va cam) OR (va cham)) xuc ban hanh va ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tao nang cau hoi. lieu ((va cam) OR (va cham)) xuc ban hanh va ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach tao nang cau hoi. lieu ((va cam) OR (va cham)) xuc ban hanh va ((dua tren) or (cuu tre))*.