Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham xuc » cam xuc, chat xuc, cham soc
mai khoi » mai khoa, tai khoa, dai khoa
hanh tai » thanh tai, hang tai, han tai
cac khoi » cac thoi, cac khoan, cach thoi
cuu tre » cua tre, cau treo
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
ve cham » va cham, ve chat, vu cham
xuc va » duc va, tuc va, luc va

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) OR (cac khoi)). hieu ve cham xuc va 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) OR (cac khoi)). hieu ve cham xuc va 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) OR (cac khoi)). hieu ve cham xuc va hanh tai ((cuu tre) or (cau tren))*".