Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cao tang » cao dang
su sach » so sach, vu sach
xuc van » duc van, luc van, vuc van
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
cu tren » tu tren, dua tren
tai cu » tai cuc, tai cua, tai co

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky sang) or (((ky tang) or (cao tang)))) mai hoi. hieu van cam xuc van hanh tai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (((ky tang) OR (cao tang)))) mai hoi. hieu van cam xuc van hanh tai cu tren.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (((ky tang) or (cao tang)))) mai hoi. hieu van cam xuc van hanh tai cu tren*.