Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
hieu viec » nhieu viec, hieu ve, sieu viet
viec cay » viec xay, viec hay, viec cua
cay thuc » cay thuoc, can thuc, day thuc
vu khach » vu khanh, vu khac, vay khach
thanh vi » hanh vi, thanh va, thanh ve
luu tre » luu tru, cuu tre
vu sach » vu bach, su sach
hang xa » hoang xa, hang va, hang ca
luy tre » luyen tre
y hang » ly hang, ty hang, yu hang

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)) y hang xa hoi. hieu viec cay thuc vat thanh vi ((luu tre) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) y hang xa hoi. hieu viec cay thuc vat thanh vi ((luu tre) OR (luy tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) y hang xa hoi. hieu viec cay thuc vat thanh vi ((luu tre) or (luy tre))".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) y hang xa hoi. hieu viec cay thuc vat thanh vi ((luu tre) or (luy tre))*.