Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vu khach » vu khanh, vu khac, vay khach
thu nang » thi nang, thu hang, thu bang
vu sach » vu bach, su sach
dau tuc » dau tu, cau truc, dau nuoc
dao tuc » dao duc
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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: ((vu sach) or (vu khach)) thu nang ma hoi. lieu va ((dau tuc) OR (dao tuc)) van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) thu nang ma hoi. lieu va ((dau tuc) OR (dao tuc)) van hanh vi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) thu nang ma hoi. lieu va ((dau tuc) OR (dao tuc)) van hanh vi cuu tre*".