Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham xuc » cam xuc, chat xuc, cham soc
cac khoi » cac khoan, cach thoi, hoc khoi
hanh tai » thanh tai, hang tai, han tai
cac thoi » cac toi, cac hop, cac tro
cuu tre » cua tre, cau treo
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
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: su sach ky dang ((cac khoi) OR (cac thoi)). 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: su sach ky dang ((cac khoi) OR (cac thoi)). 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: "su sach ky dang ((cac khoi) OR (cac thoi)). hieu ve cham xuc va hanh tai ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang ((cac khoi) OR (cac thoi)). hieu ve cham xuc va hanh tai ((cuu tre) or (cau tren))*.