Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve luat » va luat, ve thuat
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
su hien » su kien, su tien, thu hien
tuc va » thuc va, truc va, duc va
dao ve » bao ve, dap ve, dau ve
ve su » va su

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 ky ((nang xa) OR (lang xa)) hoi. hieu ve luat ((tuc va) or (tuc xa)) dao ve su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (lang xa)) hoi. hieu ve luat ((tuc va) OR (tuc xa)) dao ve su hien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) OR (lang xa)) hoi. hieu ve luat ((tuc va) or (tuc xa)) dao ve su hien".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) OR (lang xa)) hoi. hieu ve luat ((tuc va) or (tuc xa)) dao ve su hien*.