Perhaps you should try some spelling variations:
thiet hach » thuyet hach, thiet hai, chiet tach
thien hach » thien thanh, hien hanh
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » dung cong, thong cong, hang cong
trung cam » trung tam, trung cap, trung nam
cam nhung » cam hung, nam nhung, tham nhung
san khan » san khau, san phan, van khanh
san khac » san khau, sai khac, can khach

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 hach) or (thien hach)) - hanh trung cam nhung cong ((san khan) OR (san khac)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet hach) OR (thien hach)) - hanh trung cam nhung cong ((san khan) OR (san khac)) cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet hach) or (thien hach)) - hanh trung cam nhung cong ((san khan) OR (san khac)) cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet hach) or (thien hach)) - hanh trung cam nhung cong ((san khan) OR (san khac)) cap*.