Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dua tren » dung tren
sach bai » sach dao, cac bai, sach xa
nano cau » nang cau, bang cau, nano va
ban hanh » ban hang
sach bao » sach dao, sach bac, cach bao
cuc ban » cua ban, cac ban, cuu ban
hanh va » hang va, hanh vi
cam cuc » cam xuc, cham cuu, pham cuc
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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 bao) or (sach bai)) nano cau hoi. hieu va cam cuc ban hanh va ((dua tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach bao) OR (sach bai)) nano cau hoi. hieu va cam cuc ban hanh va ((dua tren) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: vu ((sach bao) or (sach bai)) nano cau hoi. hieu va cam cuc ban hanh va ((dua tren) or (cau tren))*.