Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang tai » hang va, dung tai
nhan luc » nang luc
ban than » ban thanh, van thanh, ban hang
than lap » thanh lap, phan lap, toan lap
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
tai hoi » tai khoi, dai hoi, tai hai
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
luc ban » duc ban, cuc ban, luc bat
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty hang tai hoi. hieu va nhan luc ban than lap ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty hang tai hoi. hieu va nhan luc ban than lap ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach ty hang tai hoi. hieu va nhan luc ban than lap ((cua tre) or (cua te))*.