Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
truc va » thuc va, trung va
han tai » hang tai, nhan tai, van tai
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
tai su » tai so, tai tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky nang ma hoi. hieu van cam ((truc va) or (thuc vat)) han tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky nang ma hoi. hieu van cam ((truc va) OR (thuc vat)) han tai su triet.
• Adding a wildcard symbol may retrieve word variants: te san ky nang ma hoi. hieu van cam ((truc va) or (thuc vat)) han tai su triet*.