Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
toc sach » hoc sach, doc sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
tuan duc » tran duc, xuan duc, than duc
van tuan » van quan, van ban, anh tuan
hieu van » hieu va, thien van, lieu va
lai cau » lai chau, lai cam, loi cau
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 tuan duc va 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 (ty xang)) cao hoi. hieu van tuan duc va hanh lai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((ty nang) or (ty xang)) cao hoi. hieu van tuan duc va hanh lai cau tren*.