Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
danh sai » dung sai, danh bat, danh dau
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cam tuc » cam xuc, cam tu, nam thuc
va danh » va dinh, va dan, va hanh
van cam » van nam, van lam, van cau
lang xa » lang ha, lang van
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((lang xa) OR (dang xay)) hoi. hieu van cam tuc va danh sai ((va triet) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((lang xa) OR (dang xay)) hoi. hieu van cam tuc va danh sai ((va triet) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((lang xa) OR (dang xay)) hoi. hieu van cam tuc va danh sai ((va triet) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach y ((lang xa) OR (dang xay)) hoi. hieu van cam tuc va danh sai ((va triet) or (cua te))*.