Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau triet » cau trieu, su triet, cua triet
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau trieu
dau thi » cau thi, dan thi, dao thi
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
van cac » van hac, van cau, van bac
xuc va » duc va, tuc va, luc va
va dau » va dao

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) or (thuoc sach)) ky lang xa hoi. hieu van cac xuc va dau thi ((cau treo) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky lang xa hoi. hieu van cac xuc va dau thi ((cau treo) OR (cau triet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky lang xa hoi. hieu van cac xuc va dau thi ((cau treo) or (cau triet))*.