Perhaps you should try some spelling variations:
xang mai » lang mai, sang mai, hoang mai
sinh cau » trinh cau, sinh vat, sinh va
vinh cau » vinh cuu, minh cau, tinh cau
sach ty » sach y, sach tu, sach thu
te sach » toc sach
qua cac » cua cac
mai hoi » mai khoi, dai hoi, lai hoi
toc ca » toc cao, toc ta, toc ba
toc co » hoc co, tuc co

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 xang mai hoi. hieu qua cac ((toc ca) or (toc co)) dao ((vinh cau) OR (sinh cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang mai hoi. hieu qua cac ((toc ca) OR (toc co)) dao ((vinh cau) OR (sinh cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty xang mai hoi. hieu qua cac ((toc ca) or (toc co)) dao ((vinh cau) OR (sinh cau)) tren".
• Adding a wildcard symbol may retrieve word variants: te sach ty xang mai hoi. hieu qua cac ((toc ca) or (toc co)) dao ((vinh cau) OR (sinh cau)) tren*.