Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
ban hanh » ban hang
lang ha » long ha
cham tu » pham tu, cam tu, chai tu
tu cham » toc cham, thi cham
hieu tu » chieu tu, hieu tuc, hien tu
tu sach » thu sach, su sach, tu cach
nang xa » nang x, lang xa, nang ma
te sach » toc sach
tu ban » thu ban, te ban
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (te sach)) y ((nang xa) or (lang ha)) hoi. hieu tu cham tu ban hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y ((nang xa) OR (lang ha)) hoi. hieu tu cham tu ban hanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) y ((nang xa) or (lang ha)) hoi. hieu tu cham tu ban hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) y ((nang xa) or (lang ha)) hoi. hieu tu cham tu ban hanh vi cau tren*.