Perhaps you should try some spelling variations:
dieu cua » dieu tra
dien cua » dien cuc, dien cu, tien cua
va nhan » van nhan, ca nhan, va phan
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
cao suc » cao su, cao duc
ve cao » va cao, ve bao, ve cac
suc va » duc va, tuc va, luc va
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cao suc va nhan ((dien cua) or (dieu cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cao suc va nhan ((dien cua) OR (dieu cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cao suc va nhan ((dien cua) or (dieu cua)) te".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cao suc va nhan ((dien cua) or (dieu cua)) te*.