Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh vit » hanh vi, danh viet, hanh tiet
sach ky » sach y, sach ty, sach kem
thi van » thi lan, thi hanh, thi nang
ca tren » cau tren, cu tren, la tren
sac ky » cac ky, sai ky
nam tu » nam thu, nam thuc
tu van » tu va
vit ca » viet ca, viet 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 ky) or (sac ky)) nang x ho. ((thien van) or (thi van)) nam tu van hanh vit ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x ho. ((thien van) OR (thi van)) nam tu van hanh vit ca tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x ho. ((thien van) or (thi van)) nam tu van hanh vit ca tren*.