Perhaps you should try some spelling variations:
phan nghien » phap nghien, luan nghien
thuat lanh » thuat lap, thuat san
lanh phan » anh phan, hanh phan, thanh phan
nuoc sach » nguoi sach, hoc sach, cuoc cach
sach nghe » sach nghiep, sach nha, anh nghe
nghien d » nghiem d, nghien o, nghiem de
d hoc » du hoc, ad hoc, de 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 phan nghien d hoc ) or ( nuoc sach nghe nghiep ((tu hoc) or (te hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat lanh phan nghien d hoc ) OR ( nuoc sach nghe nghiep ((tu hoc) OR (te hoc)) )).
• Adding a wildcard symbol may retrieve word variants: (( thuat lanh phan nghien d hoc ) or ( nuoc sach nghe nghiep ((tu hoc) or (te hoc)) ))*.