Perhaps you should try some spelling variations:
vien sach » vien bach, dien sach, viet sach
sach duoc » sach nuoc, sach dao, sach dung
lieu vien » lieu dien, lieu viet, dieu kien
cau tren » cu tren, dau tren, ca tren
nang doc » nang luc
xach tay » canh tay
doc cau » hoc cau, doc cao, doc chat
va nang » van nang, da nang, cam nang
duoc va » nuoc va, duc va, duoc ma
sach ty » sach y, sach thu, sach hay
sach tu » sach thu, cach tu, sach uu
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((((sach ty) or (xach tay))) or (sach tu)) nang xa hoi. lieu vien sach duoc va nang doc cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((((sach ty) OR (xach tay))) OR (sach tu)) nang xa hoi. lieu vien sach duoc va nang doc cau tren.
• Adding a wildcard symbol may retrieve word variants: vu ((((sach ty) or (xach tay))) or (sach tu)) nang xa hoi. lieu vien sach duoc va nang doc cau tren*.