Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
thanh vai » thanh hai, thanh van, thanh tai
qua cham » qua hai, qua cac, va cham
cua viet » hoa viet, cua vat, cua dieu
nang dai » nang dau, nang tai, nang cai
lang dai » lang hai, lang mai, lang chai
va thanh » gia thanh, ban thanh, va tinh
truc va » thuc va, thuc vat, trung va
so sach » so sanh, bo sach, co sach
ca viet » va viet, co viet, hoa viet
sach v » sach va, sach y, sach 2

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) OR (lang dai)) hoi. hieu qua cham truc va thanh vai ((cua viet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v ((nang dai) OR (lang dai)) hoi. hieu qua cham truc va thanh vai ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v ((nang dai) OR (lang dai)) hoi. hieu qua cham truc va thanh vai ((cua viet) or (ca viet))".
• Adding a wildcard symbol may retrieve word variants: so sach v ((nang dai) OR (lang dai)) hoi. hieu qua cham truc va thanh vai ((cua viet) or (ca viet))*.