Perhaps you should try some spelling variations:
khanh vai » khanh van, hanh vi, hanh va
thuy hanh » thuc hanh, thuy anh, thuy canh
toc sach » hoc sach, doc sach, thuoc sach
xa khanh » xa thanh, van khanh, dat khanh
va triet » va thiet, va trien, ve triet
thu hanh » thuc hanh, thu thanh, thi hanh
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
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 ((thu hanh) or (thuy hanh)) ca hoi. hieu va ((cac tuc) or (cac toc)) xa khanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thu hanh) OR (thuy hanh)) ca hoi. hieu va ((cac tuc) OR (cac toc)) xa khanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ((thu hanh) or (thuy hanh)) ca hoi. hieu va ((cac tuc) or (cac toc)) xa khanh vai va triet*.