Perhaps you should try some spelling variations:
thieu bang » thien bang, thieu khang, thieu quang
vu khach » vu khanh, vu khac, vay khach
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
tuc van » thuc van, truc van, tuc va
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
dau tuc » dau tu, dao tuc, cau truc
bang xa » lang xa, bang va, mang xa
va dau » va dao

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)) thieu bang xa hoi. lieu va dau tuc van hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) thieu bang xa hoi. lieu va dau tuc van hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) thieu bang xa hoi. lieu va dau tuc van hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) thieu bang xa hoi. lieu va dau tuc van hanh vi ((cua tre) OR (cuu tre))*.