Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
cong luong » cong thuong, nang luong, cong dong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
anh tang » anh bang, anh dang, anh sang
anh nang » ganh nang, anh bang, anh dang
tai doan » thai doan, tap doan, tan doan
thi doan » thai doan, thi hoan, thi loan

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 tach - ((anh tang) or (anh nang)) cua cong luong ((tai doan) OR (thi doan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - ((anh tang) OR (anh nang)) cua cong luong ((tai doan) OR (thi doan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - ((anh tang) or (anh nang)) cua cong luong ((tai doan) OR (thi doan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - ((anh tang) or (anh nang)) cua cong luong ((tai doan) OR (thi doan)) ban*.