Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cham truc » cau truc, nham thuc, pham thuc
nang dai » nang dau, nang tai, lang dai
qua cham » qua hai, qua cac, va cham
va thanh » gia thanh, ban thanh, va tinh
cua viet » hoa viet, cua vat, cua dieu
so sach » so sanh, bo sach, co sach
dai hoi » dai hoc, dai hai, dai moi
truc va » thuc va, thuc vat, trung va
ca viet » va viet, co viet, hoa viet
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. 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 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 hoi. hieu qua cham truc va thanh vai ((cua viet) OR (ca viet))*.