Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thau xay » thuat xay, tu xay, phan xay
danh vai » danh sai, danh va, doanh van
cua tre » cua te, dua tren, cua thep
va danh » va dinh, va dan, va hanh
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
xay ky » tay ky
cac lo » cac lop, cac co, cac bo
nang o » nang co, nang ho, nang ro
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: thau xay ky nang o hoi. hieu va cac lo va danh vai ((((cua tre) or (cua triet))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thau xay ky nang o hoi. hieu va cac lo va danh vai ((((cua tre) OR (cua triet))) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thau xay ky nang o hoi. hieu va cac lo va danh vai ((((cua tre) or (cua triet))) or (cuu tre))*.