Perhaps you should try some spelling variations:
te sach » toc sach
cac luc » cau luc, coc luc, cac nuoc
lua tre » cua tre, dua tren, luat tri
doan vi » doan va, doan thi, doan van
luy tre » luyen tre
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ve cac luc va ((doan vi) OR (don vi)) ((lua tre) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. hieu ve cac luc va ((doan vi) OR (don vi)) ((lua tre) OR (luy tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu ve cac luc va ((doan vi) OR (don vi)) ((lua tre) or (luy tre))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu ve cac luc va ((doan vi) OR (don vi)) ((lua tre) or (luy tre))*.