Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
va cam » va cham, va cac, va cao
cuc te » cua te, cuc thue, cuc tieu
o hai » co hai, so hai, o lai
o lao » o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ((o hai) or (o lao)). hieu va cam ((xuc van) or (duc anh)) hanh tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((o hai) OR (o lao)). hieu va cam ((xuc van) OR (duc anh)) hanh tai cuc te.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((o hai) or (o lao)). hieu va cam ((xuc van) or (duc anh)) hanh tai cuc te*.