Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va
su viet » so viet
co tuc » co thuc, co tu, co toc
tuc va » thuc va, truc va, tuc xa
dam su » dan su, da su, dat su

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 ky dang xa hoi. ((hieu va) or (hieu qua)) co tuc va thanh dam su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xa hoi. ((hieu va) OR (hieu qua)) co tuc va thanh dam su viet.
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xa hoi. ((hieu va) or (hieu qua)) co tuc va thanh dam su viet*.