Perhaps you should try some spelling variations:
dat trong » dot trong, vat trong, cay trong
sach thue » sach thieu, sach tham, cach thuc
sach thu » sach thieu, sach tham, cach thuc
luc ngan » luc nganh, luc nhan, luat ngan
hang vi » hanh vi, hang di, khang voi
cau luc » cau truc, cau phuc
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach thu) or (sach thue)) nang xa hoi. hieu ve cau luc ngan ((hang vi) OR (hang va)) dat trong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach thue)) nang xa hoi. hieu ve cau luc ngan ((hang vi) OR (hang va)) dat trong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thu) or (sach thue)) nang xa hoi. hieu ve cau luc ngan ((hang vi) OR (hang va)) dat trong".
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) or (sach thue)) nang xa hoi. hieu ve cau luc ngan ((hang vi) OR (hang va)) dat trong*.