Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
cham tu » pham tu, cam tu, chai tu
hieu vu » hieu va, hieu ve, hieu su
te sach » toc sach
lang ha » long ha
nang xa » nang x, lang xa, nang ma
cho tu » choi tu, chon tu, cho cu
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: te sach y ((nang xa) or (lang ha)) hoi. hieu vu ((cham tu) or (cho tu)) van hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (lang ha)) hoi. hieu vu ((cham tu) OR (cho tu)) van hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (lang ha)) hoi. hieu vu ((cham tu) or (cho tu)) van hanh vi cau tren*.