Perhaps you should try some spelling variations:
dua tren » dung tren
te sach » toc sach
cac luc » cau luc, coc luc, cac nuoc
luy tre » luyen tre
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
va dan » ca dan, va dao, va dap
y nang » ky nang, ly nang, v nang
va dau » va dao
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 dan) OR (va dau)) vi ((dua tren) 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 dan) OR (va dau)) vi ((dua tren) OR (luy tre))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu ve cac luc ((va dan) OR (va dau)) vi ((dua tren) OR (luy tre))*.