Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh lai » hanh lam, hanh tai, thanh lap
chau tre » chay tren, chau tho, cho tre
vu sach » vu bach, su sach, vu khach
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
nang o » nang co, nang ho, nang ro
o hoc » co hoc, mo hoc, so hoc

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) or (hoc sach)) ly nang o hoc. hieu ve ((cam xuc) or (pham duc)) va hanh lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (hoc sach)) ly nang o hoc. hieu ve ((cam xuc) OR (pham duc)) va hanh lai chau tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (hoc sach)) ly nang o hoc. hieu ve ((cam xuc) or (pham duc)) va hanh lai chau tre*.