Perhaps you should try some spelling variations:
nang hoi » nang noi, nang hoc, nang ho
tu sach » thu sach, su sach, tu cach
te sach » toc sach
hoi hoi » hoi hoc, hoc hoi, hoi doi
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
cac su » cach su, cac sau, cac du
do voi » doi voi, dao voi, do moi
voi cu » voi c, hoi cu, voi co
su va » su van, tu va
va do » va dao, va doc, va co

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) y nang hoi hoi. hieu ve cac su va do voi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang hoi hoi. hieu ve cac su va do voi cu tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang hoi hoi. hieu ve cac su va do voi cu tren*.