Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
hieu van » hieu va, thien van, lieu va
lanh ty » lanh tu, canh tay, lanh tho
ty nang » ky nang, ty xang, ty hang
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
hanh de » hanh ve, hanh kem
hang di » hang doi, hang vi, hang dien
su tien » su kien, su hien, tu tieng
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

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 ty nang ((o hoi) or (o hoc)). hieu van cam duc va ((hanh de) or (hang di)) su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh ty nang ((o hoi) OR (o hoc)). hieu van cam duc va ((hanh de) OR (hang di)) su tien.
• Adding a wildcard symbol may retrieve word variants: thuat lanh ty nang ((o hoi) or (o hoc)). hieu van cam duc va ((hanh de) or (hang di)) su tien*.