Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
day cua » dai cua
dat cua » dai cua, mat cua, dan cua
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang ma » tang ma, sang ma, nang cao
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu vu cham ((soc va) or (loc va)) dan ((dat cua) OR (day cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu vu cham ((soc va) OR (loc va)) dan ((dat cua) OR (day cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu vu cham ((soc va) or (loc va)) dan ((dat cua) OR (day cua)) tre*".