Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hang dau » hang va, hang tai
tu sach » thu sach, te sach, tu cach
suc van » su van, duc van, luc van
cao suc » cao su, cao duc
qua cao » qua cac, qua ca, qua cai
dau hoi » cau hoi, dai hoi, dan hoi
ky hang » ky nang, ly hang, ky dang
su sach » so sach, vu sach
ve cua » le cua, te cua, ve cum
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky hang dau hoi. hieu qua cao suc van thanh ((ve cua) OR (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky hang dau hoi. hieu qua cao suc van thanh ((ve cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky hang dau hoi. hieu qua cao suc van thanh ((ve cua) OR (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky hang dau hoi. hieu qua cao suc van thanh ((ve cua) OR (de cua)) tre*.