Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
nam duc » nam duoc, pham duc, nam thuc
va danh » va dinh, va hanh, dia danh
cu dan » cua dan, ca dan, co dan
va dan » ca dan, va dao, va dau
di cua » dai cua, doi cua, de cua
tu dan » tuc dan, tu ban, tu can

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

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