Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
tham duc » pham duc, tham du, than duc
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
ly quang » le quang, vu quang
toc sach » hoc sach, doc sach, thuoc sach
ty nang » ky nang, ty xang, ty hang
duc van » duc va, duc tan, duc manh
lai cau » lai chau, lai cam, loi cau

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