Perhaps you should try some spelling variations:
sach trach » sach tranh, sach truc, sat trach
vao nghien » va nghien, tam nghien, dau nghien
nhiem duoc » nghiem duoc, nhiem cuoc, nghiem nuoc
nghien so » nghiep so, nghien o, nghiem son
hiem duoc » nghiem duoc, nhiem cuoc, bien duoc
lanh vao » lanh dao, lanh va, hanh va
su lanh » su anh, tu lanh, su thanh
su sach » so sach, vu sach
so hoc » co hoc, mo hoc, so hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su lanh vao nghien so hoc ) or ( su sach trach ((nhiem duoc) or (hiem duoc)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su lanh vao nghien so hoc ) OR ( su sach trach ((nhiem duoc) OR (hiem duoc)) hoc )).
• Adding a wildcard symbol may retrieve word variants: (( su lanh vao nghien so hoc ) or ( su sach trach ((nhiem duoc) or (hiem duoc)) hoc ))*.