Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
anh tay » canh tay, anh ta, anh hay
hieu va » lieu va, hieu qua
cac loc » cac lop, cac toc, cac hoc
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
anh ha » anh va, anh ta, anh ma
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky ((anh tay) or (anh ha)) thai. hieu va cac loc ((van hanh) or (va danh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((anh tay) OR (anh ha)) thai. hieu va cac loc ((van hanh) OR (va danh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((anh tay) or (anh ha)) thai. hieu va cac loc ((van hanh) or (va danh)) vi cua tre*.