Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
lang cac » bang cac, hang cac, dang cac
cac thoi » cac toi, cac hop, cac tro
hanh tai » thanh tai, hang tai, han tai
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van dam
ky lang » ky nang, ky dang, ky tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang cac thoi. hieu ((van cam) OR (van cau)) duc va hanh tai ((cuu tre) or (dau tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang cac thoi. hieu ((van cam) OR (van cau)) duc va hanh tai ((cuu tre) OR (dau tieng)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang cac thoi. hieu ((van cam) OR (van cau)) duc va hanh tai ((cuu tre) or (dau tieng))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang cac thoi. hieu ((van cam) OR (van cau)) duc va hanh tai ((cuu tre) or (dau tieng))*.