Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sang tao » hang tai
hanh lai » hanh lam, hanh tai, thanh lap
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
cua te » cua tu

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 sang tao hoi. hieu ve cac duc va hanh lai ((cua te) or (((cuu tre) OR (cau tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang tao hoi. hieu ve cac duc va hanh lai ((cua te) OR (((cuu tre) OR (cau tren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang tao hoi. hieu ve cac duc va hanh lai ((cua te) or (((cuu tre) OR (cau tren))))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang tao hoi. hieu ve cac duc va hanh lai ((cua te) or (((cuu tre) OR (cau tren))))*.