Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
truc va » thuc va, trung va
han tai » hang tai, nhan tai, van tai
ban ky » dan ky
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 ((ban ky) OR (van ky)) nang xa 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 ((ban ky) OR (van ky)) nang xa hoi. hieu van cam ((truc va) OR (thuc vat)) han tai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((ban ky) OR (van ky)) nang xa hoi. hieu van cam ((truc va) or (thuc vat)) han tai su triet".
• Adding a wildcard symbol may retrieve word variants: te ((ban ky) OR (van ky)) nang xa hoi. hieu van cam ((truc va) or (thuc vat)) han tai su triet*.