Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hanh lai » hanh lam, hanh tai, thanh lap
chau tre » chay tren, chau tho, cho tre
hoc sach » hoc sinh, hoc cac, hoc anh
ly nang » ky nang, ly hang, ly quang
ly vang » ly hang, ly van, ly quang
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
ve cam » ve cham, ve cac, va cam
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 khach) or (hoc sach)) ((ly nang) or (ly vang)) o hoc. hieu ve cam duc va hanh lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (hoc sach)) ((ly nang) OR (ly vang)) o hoc. hieu ve cam duc va hanh lai chau tre.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (hoc sach)) ((ly nang) or (ly vang)) o hoc. hieu ve cam duc va hanh lai chau tre*.