Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tuong van » truong van, duong van, thong van
trong van » trong cac
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien hach - canh tranh cua nhung ((tuong van) OR (trong van)) ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - canh tranh cua nhung ((tuong van) OR (trong van)) ((toan tai) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - canh tranh cua nhung ((tuong van) OR (trong van)) ((toan tai) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - canh tranh cua nhung ((tuong van) OR (trong van)) ((toan tai) or (toan ban))*.