Perhaps you should try some spelling variations:
thiet dang » thien dang, nhiet dong, nhiet nang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cua nhung » va nhung
duong ban » dong ban, duong san, duong dan
duong van » duong va, luong va, dang van
thanh tap » thanh lap, thanh tai, thanh tay
anh tang » anh bang, anh nang, anh sang
anh dang » anh dong, anh dung, anh bang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet dang - ((anh tang) or (anh dang)) cua nhung ((duong ban) OR (duong van)) thanh tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet dang - ((anh tang) OR (anh dang)) cua nhung ((duong ban) OR (duong van)) thanh tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet dang - ((anh tang) or (anh dang)) cua nhung ((duong ban) OR (duong van)) thanh tap".
• Adding a wildcard symbol may retrieve word variants: hoc thiet dang - ((anh tang) or (anh dang)) cua nhung ((duong ban) OR (duong van)) thanh tap*.