Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
ve triet » va trien, su triet
hieu van » thien van, lieu va, hieu ve
thanh va » thanh van, hanh va, thanh ha
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
va ve » va de, va le, va vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ly nang) OR (ly hang)) xa hoi. ((hieu van) or (hieu va)) cam thuc van thanh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly hang)) xa hoi. ((hieu van) OR (hieu va)) cam thuc van thanh va ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) OR (ly hang)) xa hoi. ((hieu van) or (hieu va)) cam thuc van thanh va ve triet*".