Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
lang mai » lang dai, lang hai, lang man
mai khoi » mai khoa, tai khoa, cac khoi
cham xuc » cam xuc, chat xuc, cham soc
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
va hanh » va thanh, va danh, ban hanh
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
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 mai khoi. hieu ve cham xuc ((va hanh) OR (van hanh)) tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang mai khoi. hieu ve cham xuc ((va hanh) OR (van hanh)) tai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang mai khoi. hieu ve cham xuc ((va hanh) OR (van hanh)) tai ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang mai khoi. hieu ve cham xuc ((va hanh) OR (van hanh)) tai ((cuu tre) or (cau tren))*.