Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
danh va » doanh va, hanh va, anh va
sac ky » cac ky, sai ky
du va » dau va, tu va, vu va
su va » su van, tu va

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

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