Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
troi cua » tri cua, tro cua, doi cua
van hoc » van hoa
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
hoi cua » hoi chuc
su can » su van, su cao, tu can
can ky » van ky, dan ky, ban ky
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: su can ky nang o hoi. hieu van hoc nuoc ((va hanh) or (va danh)) ((hoi cua) or (troi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su can ky nang o hoi. hieu van hoc nuoc ((va hanh) OR (va danh)) ((hoi cua) OR (troi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su can ky nang o hoi. hieu van hoc nuoc ((va hanh) or (va danh)) ((hoi cua) or (troi cua)) tre*.