Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
thanh va » thanh van, hanh va, thanh ha
thanh vi » hanh vi, thanh ve, nhanh vi
tru nang » tra nang, tri nang, truc nano
xuc van » duc van, luc van, vuc van
hai xuc » hai cuc, hai xu, chat xuc
qua hai » qua hoat
tu nang » tu nong, tu nano, tu lang
luu tre » luu tru, cuu tre, luy tre

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ((tu nang) or (tru nang)) xa hoi. hieu qua hai xuc van ((thanh vi) OR (thanh va)) luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ((tu nang) OR (tru nang)) xa hoi. hieu qua hai xuc van ((thanh vi) OR (thanh va)) luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ((tu nang) or (tru nang)) xa hoi. hieu qua hai xuc van ((thanh vi) OR (thanh va)) luu tre".
• Adding a wildcard symbol may retrieve word variants: vu khach ((tu nang) or (tru nang)) xa hoi. hieu qua hai xuc van ((thanh vi) OR (thanh va)) luu tre*.