Perhaps you should try some spelling variations:
khau viet » khoan viet, phap viet, hai viet
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
chat vuc » chat xuc, chat va, chat huu
tai khau » tai khu, tai khoan, tai khoa
thu sach » tu sach, thuat sach, thuoc sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
vuc van » duc van, luc van, thuc van
su sach » so sach, vu sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (su sach)) ky nang x ho. ((hieu ve) OR (hieu va)) chat vuc van thanh tai khau viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang x ho. ((hieu ve) OR (hieu va)) chat vuc van thanh tai khau viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ky nang x ho. ((hieu ve) OR (hieu va)) chat vuc van thanh tai khau viet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang x ho. ((hieu ve) OR (hieu va)) chat vuc van thanh tai khau viet*.