Perhaps you should try some spelling variations:
thue hanh » thue thanh, thuc hanh, thuy hanh
sach thue » sach thu, sach thieu, sach tham
khanh vai » khanh van, hanh vi, hanh va
toc sach » hoc sach, doc sach, thuoc sach
xa khanh » xa thanh, van khanh, dat khanh
va trien » va truyen, va thiet, va tuyen
cac tuc » cac tac, cac nuoc, cac cuoc
cac toc » cac toi, cac nuoc, cac thoi
hanh ca » hanh cac, hanh cat, hanh cua
cac tu » cac thu, cach tu, cac du
ca hoi » cau hoi, cua hoi, xa hoi
vai va » mai va, dai va, hai va

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 thue hanh ca hoi. hieu qua ((((cac tuc) or (cac tu))) or (cac toc)) xa khanh vai va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thue hanh ca hoi. hieu qua ((((cac tuc) OR (cac tu))) OR (cac toc)) xa khanh vai va trien.
• Adding a wildcard symbol may retrieve word variants: toc sach thue hanh ca hoi. hieu qua ((((cac tuc) or (cac tu))) or (cac toc)) xa khanh vai va trien*.