Perhaps you should try some spelling variations:
nhat hang » nhat hanh, nha hang, nhat trang
cau tren » cu tren, dau tren, ca tren
hang vi » hang va, hanh vi, hang di
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
vi cau » va cau, ve cau, di cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang cao)) hoi. ((hieu ve) OR (hieu va)) cac luc nhat hang vi cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (nang cao)) hoi. ((hieu ve) OR (hieu va)) cac luc nhat hang vi cau tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang cao)) hoi. ((hieu ve) OR (hieu va)) cac luc nhat hang vi cau tren*.