Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh trinh » canh tranh, hanh chinh
quan nhung » qua nhung, cua nhung, quang hung
luan chung » luan chinh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cong tanh » cong thanh, cong tinh, cong danh
cong tan » cong tac, cong san, cong thanh
tuan tu » tuan thu, tran tu, toan tu

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 - hanh trinh ((quan nhung) OR (luan chung)) ((cong tanh) or (cong tan)) tuan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh trinh ((quan nhung) OR (luan chung)) ((cong tanh) OR (cong tan)) tuan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - hanh trinh ((quan nhung) OR (luan chung)) ((cong tanh) or (cong tan)) tuan tu".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh trinh ((quan nhung) OR (luan chung)) ((cong tanh) or (cong tan)) tuan tu*.