Perhaps you should try some spelling variations:
thien van » thi van
bach thuc » cach thuc, bach thu, thach thuc
hieu van » hieu va, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
hanh va » hang va, hanh vi
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
lai cua » hai cua, lai chau, thai cua
va hoi » xa hoi, va hoc, va hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach thuc hanh va hoi. ((hieu van) or (thien van)) cam duc van hanh ((lai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach thuc hanh va hoi. ((hieu van) OR (thien van)) cam duc van hanh ((lai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: vu bach thuc hanh va hoi. ((hieu van) or (thien van)) cam duc van hanh ((lai cua) or (dai cua)) tre*.