Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tan hanh » tan thanh, tang hanh, toan hanh
cua tre » cua te, cua triet, dua tren
hanh ca » hanh cac, hanh cat, hanh cua
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky dang ha hoi. hieu ((van cau) or (van nam)) duc tan hanh ca ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky dang ha hoi. hieu ((van cau) OR (van nam)) duc tan hanh ca ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky dang ha hoi. hieu ((van cau) or (van nam)) duc tan hanh ca ((cua tre) or (cuu tre))*.