Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
vap nhung » va nhung, ve nhung, voi nhung
thanh cad » thanh ca, thanh cac, thanh cham
tung vap » tung va, trung van, tuong vao
cong ban » cong bang, cong san, cong tan
hanh cad » hanh cac, hanh cat, hanh cap

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) OR (thuat tach)) - thanh tung vap nhung cong ban ((thanh cad) or (hanh cad))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat tach)) - thanh tung vap nhung cong ban ((thanh cad) OR (hanh cad)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) OR (thuat tach)) - thanh tung vap nhung cong ban ((thanh cad) or (hanh cad))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) OR (thuat tach)) - thanh tung vap nhung cong ban ((thanh cad) or (hanh cad))*.