Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
thanh vu » thanh va, thanh ve, thanh tu
va trien » va truyen, va thiet, va tuyen
hieu ve » hieu va
su sai » su tai, su hai, su dai
sai ky » sac ky
vu va » vu van, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky nang x ho. ((hieu ve) OR (hieu van)) nam thuc van thanh vu va trien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang x ho. ((hieu ve) OR (hieu van)) nam thuc van thanh vu va trien".
• Adding a wildcard symbol may retrieve word variants: su sai ky nang x ho. ((hieu ve) OR (hieu van)) nam thuc van thanh vu va trien*.