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
nghiep tu » nghiep vu, nghiep vua, nghiep cua
de hoc » te hoc, du hoc, dien hoc
tu hoc » te hoc
d hoc » du hoc, ad hoc, y 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 (de hoc)) ) or ( nuoc sach nghe nghiep tu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat lanh phan nghien ((d hoc) OR (de hoc)) ) OR ( nuoc sach nghe nghiep tu hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuat lanh phan nghien ((d hoc) OR (de hoc)) ) or ( nuoc sach nghe nghiep tu hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thuat lanh phan nghien ((d hoc) OR (de hoc)) ) or ( nuoc sach nghe nghiep tu hoc ))*.