Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
toc sach » hoc sach, doc sach, thuoc sach
hanh nam » thanh nam, hanh lam, hanh ngay
tham duc » pham duc, tham du, than duc
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
nam cau » nam cao, nam cac, nam ca
va hanh » van hanh, va thanh, va danh
ty nang » ky nang, ty hang, ly nang
cao hoi » cau hoi, co hoi, cao hoc

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) or (toc sach)) ((ty nang) or (ty xang)) cao hoi. hieu van tham duc va hanh nam cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ty nang) OR (ty xang)) cao hoi. hieu van tham duc va hanh nam cau tren.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((ty nang) or (ty xang)) cao hoi. hieu van tham duc va hanh nam cau tren*.