Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham duc » pham duc, cham soc, pham duy
dua tren » dung tren
hang tai » hang va
hang lap » sang lap, hang la, hang tap
ban hang » ngan hang
duc ban » duc tan, duc van, dua ban
te sach » toc sach
sach ty » sach y, sach tu, sach thu
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((hang tai) OR (dung tai)) hoi. hieu qua cham duc ban hang lap ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((hang tai) OR (dung tai)) hoi. hieu qua cham duc ban hang lap ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((hang tai) OR (dung tai)) hoi. hieu qua cham duc ban hang lap ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((hang tai) OR (dung tai)) hoi. hieu qua cham duc ban hang lap ((dua tren) or (cua te))*.