Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tai cua » thai cua, tai cuc, tri cua
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 ty nang ma hoi. ((hieu ve) OR (hieu va)) ((cam duc) or (giao duc)) van thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. ((hieu ve) OR (hieu va)) ((cam duc) OR (giao duc)) van thanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoi. ((hieu ve) OR (hieu va)) ((cam duc) or (giao duc)) van thanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. ((hieu ve) OR (hieu va)) ((cam duc) or (giao duc)) van thanh tai cua te*.