Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
sach ty » sach y, sach tu, sach thu
nam tuc » nam truc, nam tu, nam thuoc
nang xa » nang x, lang xa, nang ma
hanh oi » hanh noi, hanh moi, hanh voi
tu sach » thu sach, su sach, te sach
oi su » ki su, vi su

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

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