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