Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tuong vao » tuong va, tuong vo, tuong dao
hang cong » dang cong, hang nong, bang cong
tung vap » tung va, trung van, dung va
cong san » cong tac
thanh ca » thanh cha, thanh cac, thanh ha
hanh cap » hanh cac, hanh cat, hanh cad

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 - thanh ((tung vap) or (tuong vao)) hang cong san ((thanh ca) or (hanh cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh ((tung vap) OR (tuong vao)) hang cong san ((thanh ca) OR (hanh cap)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh ((tung vap) or (tuong vao)) hang cong san ((thanh ca) or (hanh cap))*.