Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
danh hai » dang hai, lanh hai, manh hai
duc manh » suc manh, duc anh, duc minh
hieu van » hieu va, thien van, lieu va
kho tang » cao tang
van cam » van nam, van lam, van cau
xuc ban » duc ban, cuc ban, quoc ban
ky lang » ky nang, ky dang, ky tang
hai cua » thai cua, dai cua, hoi cua
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: hoc sach ((ky lang) or (kho tang)) xa hoi. hieu van cam ((xuc ban) or (duc manh)) danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky lang) OR (kho tang)) xa hoi. hieu van cam ((xuc ban) OR (duc manh)) danh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky lang) or (kho tang)) xa hoi. hieu van cam ((xuc ban) or (duc manh)) danh hai cua tre*.