Perhaps you should try some spelling variations:
thien van » thi van
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
su sach » so sach
van cac » van hac, van cau, van bac
lai cua » dai cua, hai cua, lai chau
vu sach » vu bach, vu khach
nang o » nang co, nang ho, nang ro
luc va » tuc va, loc va
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (su sach)) ky nang o hoi. thien van cac ((luc va) or (duc va)) hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky nang o hoi. thien van cac ((luc va) OR (duc va)) hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ky nang o hoi. thien van cac ((luc va) or (duc va)) hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ky nang o hoi. thien van cac ((luc va) or (duc va)) hanh lai cua viet*.