Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
van pham » san pham, van phan, van phat
lieu van » lieu va, hieu van, sieu van
pham duy » pham duc
nang doc » nang luc
lanh ky » hanh ky, nganh ky, thanh ky
hanh de » hanh ve, hanh kem
hang vi » hang va, hanh vi, hang di
su viet » so viet
nang o » nang co, nang ho, nang ro
duy va » duy vat, duy van, day va

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) or (nang doc)) hoi. lieu van pham duy va ((hanh de) or (hang vi)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh ky ((nang o) OR (nang doc)) hoi. lieu van pham duy va ((hanh de) OR (hang vi)) su viet.
• Adding a wildcard symbol may retrieve word variants: thuat lanh ky ((nang o) or (nang doc)) hoi. lieu van pham duy va ((hanh de) or (hang vi)) su viet*.