Perhaps you should try some spelling variations:
hieu cach » hieu cac, chieu sach, hieu ca
hanh tang » hanh trang, anh tang, hanh mang
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
tang cua » mang cua, hang cua, tang luan
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cach - hanh tang cua ((hang cong) OR (dang cong)) dan ((than cau) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - hanh tang cua ((hang cong) OR (dang cong)) dan ((than cau) OR (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - hanh tang cua ((hang cong) OR (dang cong)) dan ((than cau) OR (than cap))*.