Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van tuan » van quan, anh tuan
van nang » van quang, van dong, van dung
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve cau » ke cau, va cau, ve cac
v nang » va nang, vu nang, voi nang
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((v nang) OR (van nang)) ma hoi. hieu ve cau luc ((van tuan) or (van ban)) le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((v nang) OR (van nang)) ma hoi. hieu ve cau luc ((van tuan) OR (van ban)) le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((v nang) OR (van nang)) ma hoi. hieu ve cau luc ((van tuan) or (van ban)) le cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((v nang) OR (van nang)) ma hoi. hieu ve cau luc ((van tuan) or (van ban)) le cua tre*.