Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu xac » thau xay
dan vat » dang vat, van vat, dan va
cua tre » cua te, dua tren, cua thep
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
xac ky » cac ky, sac ky, bac ky
cac lo » cac lop, cac co, cac bo
nang o » nang co, nang ho, nang ro
va dan » ca dan, va dao, va dau
lo va » lo van, lao va, ly va
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: thu xac ky nang o hoi. hieu va cac lo va dan vat ((((cua tre) or (cua triet))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu xac ky nang o hoi. hieu va cac lo va dan vat ((((cua tre) OR (cua triet))) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu xac ky nang o hoi. hieu va cac lo va dan vat ((((cua tre) or (cua triet))) or (cuu tre))*.