Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
trang cua » tranh cua, tang cua, trung cua
cua nhung » va nhung
hinh toan » thanh toan, trinh toan, manh toan
hieu vac » hieu van, hieu cac, hieu dac
hieu va » lieu va, hieu qua

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 va) or (hieu vac)) - hanh trang cua nhung cong ((hinh toan) or (tinh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu va) OR (hieu vac)) - hanh trang cua nhung cong ((hinh toan) OR (tinh toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu va) or (hieu vac)) - hanh trang cua nhung cong ((hinh toan) or (tinh toan)) cao*.