Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
su sach » so sach
vu sach » vu bach, vu khach
van cam » van nam, van lam, van cau
xuc gia » duc gia, luc gia, tuc gia
cua su » qua su
o hoa » do hoa, so hoa, o ha
o hoc » co hoc, mo hoc, so hoc

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) or (vu sach)) ky nang ((o hoa) or (o hoc)). hieu van cam xuc gia thanh dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang ((o hoa) OR (o hoc)). hieu van cam xuc gia thanh dai cua su.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang ((o hoa) or (o hoc)). hieu van cam xuc gia thanh dai cua su*.