Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lang cua » mang cua, hang cua, long cua
manh hai » lanh hai, minh hai, thanh hai
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
su sach » so sach
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
vu sach » vu bach, vu khach
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) ky dang xa hoi. hieu ve cac duc ban ((manh hai) or (lang cua)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky dang xa hoi. hieu ve cac duc ban ((manh hai) OR (lang cua)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky dang xa hoi. hieu ve cac duc ban ((manh hai) or (lang cua)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky dang xa hoi. hieu ve cac duc ban ((manh hai) or (lang cua)) cua triet*.