Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
thu hanh » thuc hanh, thu thanh, thuy hanh
hang doi » hang di, hang loi, huong doi
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
doi cua » dai cua, hoi cua
cua va » chua va, cua van, vua va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu hanh ((ky lang) OR (ky tang)) xa hoi. thien van nam ((cua va) or (cua vat)) hang doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu hanh ((ky lang) OR (ky tang)) xa hoi. thien van nam ((cua va) OR (cua vat)) hang doi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu hanh ((ky lang) OR (ky tang)) xa hoi. thien van nam ((cua va) or (cua vat)) hang doi cua triet".
• Adding a wildcard symbol may retrieve word variants: thu hanh ((ky lang) OR (ky tang)) xa hoi. thien van nam ((cua va) or (cua vat)) hang doi cua triet*.