Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
danh hai » dang hai, lanh hai, manh hai
sach ky » sac ky, sach ty, sach kem
tang xa » trang xa, tang ma, lang xa
duc van » duc va, duc tan, duc manh
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: thu ((sach ky) OR (sach y)) tang xa hoi. hieu van nam ((quoc ban) or (duc van)) danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) tang xa hoi. hieu van nam ((quoc ban) OR (duc van)) danh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach y)) tang xa hoi. hieu van nam ((quoc ban) or (duc van)) danh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach y)) tang xa hoi. hieu van nam ((quoc ban) or (duc van)) danh hai cua tre*.