Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh dai » danh dau, danh di, danh sai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va danh » va dinh, va dan, va hanh
cac luc » cau luc, coc luc, cac cuoc
vu sach » vu bach, vu khach
ly nang » ky nang, ly hang, ly vang
su sach » so sach
cua tre » cua te, cuu tre, cua triet
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: ((vu sach) or (su sach)) ly nang x hoi. hieu van ((cac luc) OR (cac nuoc)) va danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ly nang x hoi. hieu van ((cac luc) OR (cac nuoc)) va danh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (su sach)) ly nang x hoi. hieu van ((cac luc) OR (cac nuoc)) va danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ly nang x hoi. hieu van ((cac luc) OR (cac nuoc)) va danh dai cua tre*.