Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
cau tren » cu tren, dau tren, ca tren
hang tai » hang va, dung tai
va hang » van hang, va nang, va lang
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ky lang » ky dang, ky tang, tay lang
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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) OR (ky nang)) cach thoi. hieu ve cam xuc va hang tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) cach thoi. hieu ve cam xuc va hang tai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky nang)) cach thoi. hieu ve cam xuc va hang tai ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky nang)) cach thoi. hieu ve cam xuc va hang tai ((cuu tre) or (cau tren))*.