Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
thanh tai » thanh hai, thanh toan, doanh tai
doc sach » hoc sach, toc sach, nuoc sach
va thanh » gia thanh, ban thanh, va tinh
tai cua » thai cua, tai cuc, tri cua
cac lop » cac hop, cac loai
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac lo » cac co, cac bo, cac ho
cua tu » cua tuc, cua su, cua cu

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 (doc sach)) ky lang xa hoi. hieu hien ((cac lo) or (cac lop)) va thanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (doc sach)) ky lang xa hoi. hieu hien ((cac lo) OR (cac lop)) va thanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (doc sach)) ky lang xa hoi. hieu hien ((cac lo) or (cac lop)) va thanh tai cua tu*.