Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
sach van » sach han, sach va, bach van
nang dai » nang dau, lang dai, nang cai
nang tai » hang tai, tang tai, sang tai
qua cham » qua hai, qua cac, va cham
hanh vai » hanh vi, hanh va, hanh tai
cua viet » ca viet, hoa viet, cua vat
co sach » bo sach, cuon sach, hoc sach
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua

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

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