Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
truc va » thuc va, thuc vat, trung va
van cac » van hac, van cau, van bac
su sach » so sach, vu sach
vu dang » su dang, vu quang, cua dang
luy tre » luyen tre
v nang » va nang, vu nang, van nang
vi luy » vi lua, vi luu

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 (vu dang)) xa hoi. hieu van cac ((duc va) or (truc va)) hanh vi luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vu dang)) xa hoi. hieu van cac ((duc va) OR (truc va)) hanh vi luy tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (vu dang)) xa hoi. hieu van cac ((duc va) or (truc va)) hanh vi luy tre*.