Perhaps you should try some spelling variations:
luc ngan » luc nganh, luc nhan, luat ngan
tu sach » thu sach, su sach, te sach
duoi ca » cuoi cua, nuoi cay, duoc cac
cau luc » cau truc, cau phuc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
ve cau » ke cau, va cau, ve cac
doi ca » doi cua, doi cay, doi va

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 ma) or (lang xa)) hoi. hieu ve cau luc ngan hang ((doi ca) OR (duoi ca)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ma) OR (lang xa)) hoi. hieu ve cau luc ngan hang ((doi ca) OR (duoi ca)) tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang ma) or (lang xa)) hoi. hieu ve cau luc ngan hang ((doi ca) OR (duoi ca)) tren*".