Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
truc van » truc va, thuc van, truc ban
vuc nang » cuc nang, vu nang, chuc nang
hanh va » hang va
ca truc » cau truc, ca tru, ba truc
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang
qua ca » qua cac, qua cua, qua cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((v nang) or (vuc nang)) ma hoi. hieu qua ca truc van ((hanh va) OR (hanh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vuc nang)) ma hoi. hieu qua ca truc van ((hanh va) OR (hanh vi)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) or (vuc nang)) ma hoi. hieu qua ca truc van ((hanh va) OR (hanh vi)) cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (vuc nang)) ma hoi. hieu qua ca truc van ((hanh va) OR (hanh vi)) cua viet*.