Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tham luc » than luc, tham nuoc, tham thuc
doan vi » doan va, don vi, doan thi
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
tu van » tu va
luc va » duc va, tuc va, loc va
dan vi » don vi, dan va, gan vi

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

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