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