Perhaps you should try some spelling variations:
thang tai » tang tai, thanh tai, thong tai
cau tren » cu tren, dau tren, ca tren
dang xay » dang van, van xay
hang tai » hang va, dung tai
cam duc » cam xuc, cao duc, pham duc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua

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 dang xay hoi. ((hieu ve) or (hieu va)) cam duc va ((hang tai) or (thang tai)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. ((hieu ve) OR (hieu va)) cam duc va ((hang tai) OR (thang tai)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. ((hieu ve) or (hieu va)) cam duc va ((hang tai) or (thang tai)) cau tren*.