Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh lam » thanh lap, hanh kem, hanh va
hanh lai » hanh tai, thanh lap, thanh loi
tang van » dang van, hoang van, trong van
hieu van » hieu va, thien van, lieu va
te sach » toc sach
duc van » duc va, duc tan, duc manh
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
van hoc » van hoa
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (hoc sach)) ky tang van hoc. hieu van cau duc van ((hanh lai) OR (hanh lam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ky tang van hoc. hieu van cau duc van ((hanh lai) OR (hanh lam)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (hoc sach)) ky tang van hoc. hieu van cau duc van ((hanh lai) OR (hanh lam)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky tang van hoc. hieu van cau duc van ((hanh lai) OR (hanh lam)) cua tre*.