Perhaps you should try some spelling variations:
ngan dang » nhan dang, ngan danh, ngan bang
dau tren » dau tien, dat tren, dau tieng
cam luc » cam xuc, cau luc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
va dau » va dao
hang » bang, hanh

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