Perhaps you should try some spelling variations:
chat duoc » chat doc, chet duoc, thuat duoc
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van chat » cao chat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
dau cua » dai cua, day cua, cau cua
va dan » va dao, va dau, va dap
ca dan » ca dao

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 ky nang xa hoi. hieu van chat duoc ((va dan) or (((ca dan) OR (cac dan)))) dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van chat duoc ((va dan) OR (((ca dan) OR (cac dan)))) dau cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu van chat duoc ((va dan) or (((ca dan) OR (cac dan)))) dau cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van chat duoc ((va dan) or (((ca dan) OR (cac dan)))) dau cua triet*.