Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
lang van » dang van, tang van, hoang van
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
cau duc » cao duc, cau luc, chu duc
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang xa) or (lang van)) hoi. ((hieu ve) or (hieu va)) cau duc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (lang van)) hoi. ((hieu ve) OR (hieu va)) cau duc van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (lang van)) hoi. ((hieu ve) or (hieu va)) cau duc van hanh vi cuu tre*.