Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
thi van » thi lan, thi hanh, thi nang
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
hac tu » hoc tu, tac tu, cac tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach o lang xa hoi. ((thien van) or (thi van)) hac tu va hanh vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach o lang xa hoi. ((thien van) OR (thi van)) hac tu va hanh vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: so sach o lang xa hoi. ((thien van) or (thi van)) hac tu va hanh vi ((cua tre) or (cau treo))*.