Perhaps you should try some spelling variations:
thong huong » thong thuong, thong duong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hiem ngan » kim ngan, viem gan
trung vap » trung va, trung van, trung lap
trung cap » truong cao, trung tam
dan cach » dan cac, dan canh, nhan cach
cach cau » bach cau, cac cau, cach tu

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) OR (trung cap)) thong huong dan cach cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hiem ngan)) - thanh ((trung vap) OR (trung cap)) thong huong dan cach cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hiem ngan)) - thanh ((trung vap) OR (trung cap)) thong huong dan cach cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hiem ngan)) - thanh ((trung vap) OR (trung cap)) thong huong dan cach cau*.