Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, qua cua
van hanh » van thanh, ban hanh, van anh
thu cac » tu cac, thu xac, thu dac
hanh va » hang va, hanh vi
vuc van » duc van, luc van, thuc van
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
thu cuc » thi cuc, thu tuc, thu cua
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu cac) or (thu cuc)) ky tang ha noi. hieu ((qua cham) or (va cham)) vuc van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu cac) OR (thu cuc)) ky tang ha noi. hieu ((qua cham) OR (va cham)) vuc van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu cac) or (thu cuc)) ky tang ha noi. hieu ((qua cham) or (va cham)) vuc van hanh va cua tre*.