Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien
nam duoc » nam thuoc, da duoc, dat duoc
ve triet » va trien
duoc va » nuoc va, duc va, duoc ma
lanh ky » hanh ky, nganh ky, thanh ky
hang di » hang doi, hang vi, hang dien
hanh de » hanh ve, hanh kem
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat lanh ky nang o hoi. hieu van nam duoc va ((hanh de) or (hang di)) ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh ky nang o hoi. hieu van nam duoc va ((hanh de) OR (hang di)) ((su triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: thuat lanh ky nang o hoi. hieu van nam duoc va ((hanh de) or (hang di)) ((su triet) or (ve triet))*.