Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
kho tang » cao tang
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, ky trong
xuc va » duc va, tuc va, luc va
dat su » sat su
va cam » va cham, va cac, va cao
da su » dan su, va su, de su

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 tang) or (kho tang)) xa hoi. hieu va cam xuc va thanh ((dat su) or (da su)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (kho tang)) xa hoi. hieu va cam xuc va thanh ((dat su) OR (da su)) viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) or (kho tang)) xa hoi. hieu va cam xuc va thanh ((dat su) or (da su)) viet*.