Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu manh » chieu xanh, hieu nganh, dieu hanh
hiem ngan » kim ngan, viem gan
trung vap » trung cap, trung va, trung van
vap thong » va thong, van thong, phap thong
thong dan » thong van, tuong dan, thong den
dan canh » van canh, dan cach, dan hanh
canh cau » canh chau, can cau, danh cau

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 manh) or (hiem ngan)) - thanh trung vap thong thong dan canh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hiem ngan)) - thanh trung vap thong thong dan canh cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hiem ngan)) - thanh trung vap thong thong dan canh cau*.