Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua, dong cua
te sach » toc sach
di cua » dai cua, de cua, do cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ly nang) or (ly vang)) x hoi. hieu van cau duc va hanh ((di cua) OR (doi cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly nang) OR (ly vang)) x hoi. hieu van cau duc va hanh ((di cua) OR (doi cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ly nang) or (ly vang)) x hoi. hieu van cau duc va hanh ((di cua) OR (doi cua)) viet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ly nang) or (ly vang)) x hoi. hieu van cau duc va hanh ((di cua) OR (doi cua)) viet*.