Perhaps you should try some spelling variations:
kho tang » cao tang
cham loc » cham soc, chon loc, cham o
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
va cham » va chat, va tham
loc van » luoc van, hoc van, lo van
cua tre » cua te, cuu tre, cua triet

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 ((kho tang) or (ky dang)) ((van hoc) or (van hoa)). hieu va cham loc van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ((kho tang) OR (ky dang)) ((van hoc) OR (van hoa)). hieu va cham loc van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu bach ((kho tang) or (ky dang)) ((van hoc) or (van hoa)). hieu va cham loc van hanh dai cua tre*.