Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hiem ngan » kim ngan, viem gan
hoc hiem » hoc hien, hoc thieu, hoc thiet
trang he » trang ha, tang he, trang de
trong he » trong hiep, trong nha, trong thu
trong le » trong lam, trong ca, trong va
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hiem ngan - hanh ((trang he) or (((trong he) or (trong le)))) thong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hiem ngan - hanh ((trang he) OR (((trong he) OR (trong le)))) thong cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hiem ngan - hanh ((trang he) or (((trong he) or (trong le)))) thong cong dan toan cao*.