Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
qua cham » qua hai, qua cac, va cham
tinh bai » tinh bac, tinh hai, hinh bai
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
dai hoi » dai hoc, dai hai
dai moi » doi moi
truc va » thuc va, thuc vat, trung va
va tinh » may tinh
bai cua » ban cua, dai cua, bai ca
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v nang ((dai hoi) OR (dai moi)). hieu qua cham truc va tinh bai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v nang ((dai hoi) OR (dai moi)). hieu qua cham truc va tinh bai cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach v nang ((dai hoi) OR (dai moi)). hieu qua cham truc va tinh bai cua viet*.