Perhaps you should try some spelling variations:
thanh phan » thanh san, thanh toan, thanh hai
nang xay » dang xay, nganh xay, nang xuan
chat tuc » chat xuc, luat tuc, chat huu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
luy tre » luyen tre

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 ky nang xay hoi. ((hieu ve) OR (hieu va)) chat tuc xa ((thanh phan) or (thanh pho)) luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xay hoi. ((hieu ve) OR (hieu va)) chat tuc xa ((thanh phan) OR (thanh pho)) luy tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xay hoi. ((hieu ve) OR (hieu va)) chat tuc xa ((thanh phan) or (thanh pho)) luy tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xay hoi. ((hieu ve) OR (hieu va)) chat tuc xa ((thanh phan) or (thanh pho)) luy tre*.