Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
duc tuan » duc thuan, duc tan, duc toan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
cam duc » cam xuc, cao duc, pham duc
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
anh vi » hanh vi, anh va, anh ve
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 van) or (nang x)) hoi. hieu ve cam duc tuan anh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang van) OR (nang x)) hoi. hieu ve cam duc tuan anh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang van) or (nang x)) hoi. hieu ve cam duc tuan anh vi ((cua tre) or (cuu tre))*.