Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
sach va » sach xa, sach ha, sach dao
sach v » sach y, sach 2, sach vay
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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 v) or (sach va)) nang xa hoi. hieu van cac nuoc ((van hanh) OR (ban hanh)) di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach va)) nang xa hoi. hieu van cac nuoc ((van hanh) OR (ban hanh)) di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach va)) nang xa hoi. hieu van cac nuoc ((van hanh) OR (ban hanh)) di cua tu".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach va)) nang xa hoi. hieu van cac nuoc ((van hanh) OR (ban hanh)) di cua tu*.