Perhaps you should try some spelling variations:
nghiem su » nghiem xu, nghiem ngu, nghiem dau
sach lang » sach nang, sach quang, cach mang
lang nghe » cong nghe, van nghe
nghe duoc » nghiem duoc, nghe nuoi, che duoc
nhiem tu » nhiem thuc, nhiem huu, nghiem te
duoc hoc » quoc hoi
tu sach » thu sach, su sach, te sach
tu sat » tu bat, tu dat, tu hat

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

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