Perhaps you should try some spelling variations:
giam thanh » gia thanh, gian thanh, giay thanh
te sach » toc sach
dai huu » dao huu, dai hau, dai thua
dai cuu » dai cua
vu giam » vu giao, va giam, vu gia
hieu ve » hieu va, hieu van
kv nang » ky nang, ki nang, ke nang
ma hoi » mai hoi, xa hoi, ma hoa
cac vu » cac du, cac vi, cac tu
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac

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 ((v nang) or (kv nang)) ma hoi. hieu ve cac vu giam thanh ((dai cuu) or (dai huu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((v nang) OR (kv nang)) ma hoi. hieu ve cac vu giam thanh ((dai cuu) OR (dai huu)) tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((v nang) or (kv nang)) ma hoi. hieu ve cac vu giam thanh ((dai cuu) or (dai huu)) tre*.