Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
hanh tai » thanh tai, hang tai, han tai
dang xay » dang van, van xay
cham luc » cham soc, nhan luc, cham cuu
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
lang xa » lang ha, lang van
bai ky » ban ky, sai ky, bac ky
luc va » duc va, tuc va, loc va
te bai » te bao, te tai, te ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: te bai ky ((lang xa) or (dang xay)) hoi. hieu qua cham luc va hanh tai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te bai ky ((lang xa) OR (dang xay)) hoi. hieu qua cham luc va hanh tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te bai ky ((lang xa) or (dang xay)) hoi. hieu qua cham luc va hanh tai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te bai ky ((lang xa) or (dang xay)) hoi. hieu qua cham luc va hanh tai ((cua tre) OR (cuu tre))*.