Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
hang cong » dang cong, hang nong, bang cong
vang toan » van toan, quang toan, vang trang
dang toan » dang tran, dan toan, dung toan
yen tinh » tuyen tinh
tinh va » tich va, trinh van, tinh gia
ho yen » o yen, chao yen, hong yen

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho yen tinh - canh ((tinh va) OR (trinh vat)) hang cong ((vang toan) or (dang toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho yen tinh - canh ((tinh va) OR (trinh vat)) hang cong ((vang toan) OR (dang toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho yen tinh - canh ((tinh va) OR (trinh vat)) hang cong ((vang toan) or (dang toan)) cao".
• Adding a wildcard symbol may retrieve word variants: ho yen tinh - canh ((tinh va) OR (trinh vat)) hang cong ((vang toan) or (dang toan)) cao*.