Perhaps you should try some spelling variations:
kmay nang » ky nang, kha nang, may nong
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
may nang » may nong, ky nang, cam nang
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
van vat » van chat, nhan vat
vat cua » mat cua, bat cua, dat cua
tac xa » tuc xa, tac da
xa van » va van, ha van, ma van
o hoi » co hoi, o hoc, o hai

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 ((may nang) or (kmay nang)) o hoi. hieu va cac tac xa van vat cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((may nang) OR (kmay nang)) o hoi. hieu va cac tac xa van vat cua triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ((may nang) or (kmay nang)) o hoi. hieu va cac tac xa van vat cua triet*.