Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
ban thanh » ban hanh, ban hang
dau tren » dau tien, dat tren, dau trong
thanh va » thanh van, hanh va, thanh ha
cham luc » cham soc, nhan luc, cham cuu
thu sach » tu sach, thuat sach, thuoc sach
nang ma » tang ma, sang ma, nang cao
luc ban » duc ban, cuc ban, luc bat
nang xa » nang x, lang xa, mang xa
va cham » va chat, va tham

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang xa) or (nang ma)) hoi. lieu va cham luc ban thanh va ((dau tren) OR (dau tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (nang ma)) hoi. lieu va cham luc ban thanh va ((dau tren) OR (dau tieng))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (nang ma)) hoi. lieu va cham luc ban thanh va ((dau tren) OR (dau tieng))*".