Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dieu hieu » dieu hien, dieu khien, dien chieu
dinh vai » dinh van, dinh vi, dinh va
hieu cac » hieu luc, hieu va, hieu van
lang xa » lang ha, dang xay, lang van
cac cao » cac co, ca cao, bac cao
va dinh » van dinh, va kinh, va tinh
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, dua tren
sac ky » cac ky, sai ky
cao va » cao van, tao va, co va
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang ma) or (lang xa)) hoi. dieu hieu cac cao va dinh vai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang ma) OR (lang xa)) hoi. dieu hieu cac cao va dinh vai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang ma) or (lang xa)) hoi. dieu hieu cac cao va dinh vai ((cua tre) or (cua triet))*.