Perhaps you should try some spelling variations:
vien thanh » tien thanh, dien thanh, thien thanh
viet thanh » viet anh
manh trung » manh tung, thanh trung, manh hung
hiem ngan » kim ngan, viem gan
trung tac » trung tam, trong tac, trung tai
dung cong » dung trong
cong tinh » cong trinh, cong vinh, long tinh
tac dung » sach dung, xay dung, tin dung
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((vien thanh) OR (viet thanh))) or (hiem ngan)) - manh trung tac dung cong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((vien thanh) OR (viet thanh))) OR (hiem ngan)) - manh trung tac dung cong tinh toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((vien thanh) OR (viet thanh))) or (hiem ngan)) - manh trung tac dung cong tinh toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((((vien thanh) OR (viet thanh))) or (hiem ngan)) - manh trung tac dung cong tinh toan tap*.