Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
dua tren » dung tren
dang bai » dung bai, dang hai, dang ba
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, ban thanh, va tinh
cao duc » dao duc, giao duc, tao duoc
ky dang » ky nang, ky danh
cao suc » cao su
hieu ve » hieu va, hieu van
bai hoi » bai choi, bai hoc, dai hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky dang bai hoi. hieu ve ((cao suc) OR (cao duc)) va thanh vai ((cau tren) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky dang bai hoi. hieu ve ((cao suc) OR (cao duc)) va thanh vai ((cau tren) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky dang bai hoi. hieu ve ((cao suc) OR (cao duc)) va thanh vai ((cau tren) or (dua tren))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky dang bai hoi. hieu ve ((cao suc) OR (cao duc)) va thanh vai ((cau tren) or (dua tren))*.