Perhaps you should try some spelling variations:
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
tham tu » pham tu, tam tu, tham du
va hanh » van hanh, va thanh, va danh
lai cua » hai cua, lai chau, thai cua
x hoi » xa hoi, o hoi, 5 hoi

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 ((x hoi) or (x ho)). hieu van tham tu va hanh ((lai cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((x hoi) OR (x ho)). hieu van tham tu va hanh ((lai cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((x hoi) or (x ho)). hieu van tham tu va hanh ((lai cua) or (dai cua)) triet*.