Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van tuan » van quan, anh tuan
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
ve cau » ke cau, va cau, ve cac
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: hoc sach v ((nang ma) OR (sang 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: hoc sach v ((nang ma) OR (sang 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: "hoc sach v ((nang ma) OR (sang ma)) hoi. hieu ve cau luc ((van tuan) or (van ban)) le cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach v ((nang ma) OR (sang ma)) hoi. hieu ve cau luc ((van tuan) or (van ban)) le cua tre*.