Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
lang hai » lang chai, lang thai, lang ha
lang dai » lang mai, lang chai, hoang dai
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
cuu tre » cua tre, cau tren
hieu ve » hieu va, hieu van
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: toc sach ky ((lang hai) or (lang dai)) khoi. hieu ve cam xuc van hanh tai ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang hai) OR (lang dai)) khoi. hieu ve cam xuc van hanh tai ((cuu tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang hai) or (lang dai)) khoi. hieu ve cam xuc van hanh tai ((cuu tre) or (cau treo))*.