Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu lang
vi cua » vai cua, di cua
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty lang) OR (ty hang)) xa hoi. hieu van ((cac tuc) OR (cac tac)) va tinh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ty lang) or (ty hang)) xa hoi. hieu van ((cac tuc) OR (cac tac)) va tinh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty lang) or (ty hang)) xa hoi. hieu van ((cac tuc) OR (cac tac)) va tinh vi cua te*.