Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh tai » thanh tai, hang tai, hinh tai
nam thuc » nam thuoc, am thuc, nam thu
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
han tai » hang tai, nhan tai, van tai
va nam » van nam, ha nam, va nay
sac ky » cac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sai ky)) nang xa hoi. hieu va nam thuc va ((hanh tai) OR (han tai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sai ky)) nang xa hoi. hieu va nam thuc va ((hanh tai) OR (han tai)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sai ky)) nang xa hoi. hieu va nam thuc va ((hanh tai) OR (han tai)) su triet".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sai ky)) nang xa hoi. hieu va nam thuc va ((hanh tai) OR (han tai)) su triet*.