Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh hai » dang hai, lanh hai, manh hai
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
kho tang » cao tang
van lam » van nam
ky tang » ky nang, ky dang, ky trong
hai cua » thai cua, dai cua, hoi cua
thu sac » thu sach, thu san, thu xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ((ky tang) OR (kho tang)) xa hoi. hieu van lam ((quoc ban) or (duc tan)) danh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ((ky tang) OR (kho tang)) xa hoi. hieu van lam ((quoc ban) OR (duc tan)) danh hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ((ky tang) OR (kho tang)) xa hoi. hieu van lam ((quoc ban) or (duc tan)) danh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sac ((ky tang) OR (kho tang)) xa hoi. hieu van lam ((quoc ban) or (duc tan)) danh hai cua triet*.