Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
vu khac » vu kham, vu khanh, bui khac
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
soc van » oc van, sac van, soc dan
hoc van » hoc dan, hoc va, hoc vat
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua

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: ((tu sach) OR (vu khac)) y nang x ho. hieu ve cham ((soc van) OR (hoc van)) thanh va cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu khac)) y nang x ho. hieu ve cham ((soc van) OR (hoc van)) thanh va cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu khac)) y nang x ho. hieu ve cham ((soc van) OR (hoc van)) thanh va cua viet*.