Perhaps you should try some spelling variations:
luyen tre » luyen tri, huyen tren, tuyen tren
bieu hien » dieu hien, dieu khien, bien phien
thanh vi » hanh vi, thanh va, thanh ve
xa thanh » va thanh, ha thanh, ta thanh
hien cac » thien cac, vien cac, hieu cac
cac tuc » cac toc, cac tu, cac tac
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach
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: ((tu sach) or (su sach)) ky nang x hoi. bieu hien cac tuc xa thanh vi ((luy tre) OR (luyen tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. bieu hien cac tuc xa thanh vi ((luy tre) OR (luyen tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. bieu hien cac tuc xa thanh vi ((luy tre) OR (luyen tre))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. bieu hien cac tuc xa thanh vi ((luy tre) OR (luyen tre))*.